3 malfunctions. Brake light, washer fluid, and battery light will not go off. I had brakes replace rear brakes replace 6months ago. Batter;y light has been on for 5 months and washer fluid just ran out. I had the oil change and tires rotated recently and filters checked.

When the brake booster light and brake light come on after replacing the batteries in a 2017 Isuzu NPR Diesel, it could indicate a problem with the brake system or a malfunctioning brake booster.
Here are some steps you can take to troubleshoot the issue:

1. Check the brake fluid level: Low brake fluid level can cause the brake booster light and brake light to come on. Open the hood and check the brake fluid level in the reservoir. If the level is low, top it up with the recommended brake fluid and check if the lights go off.
2. Check the brake system: Inspect the brake lines, brake pads, and brake rotors for any damage or wear. If the brake pads are worn out, replace them immediately.
3. Check the brake booster: The brake booster is responsible for increasing the force applied to the brake pedal. Check the brake booster for any damage or wear. If the brake booster is malfunctioning, it will need to be replaced.
4. Reset the brake booster light: If the brake booster light and brake light stay on even after checking the brake fluid level and inspecting the brake system, it may be necessary to reset the brake booster light. To reset the brake booster light, turn the ignition switch to the "on" position without starting the engine. Pump the brake pedal 3 times, then turn the ignition switch off. Start the engine and check if the lights go off.

If none of these steps work, it is recommended to take the vehicle to a certified mechanic or the nearest Isuzu dealership for a professional diagnosis and repair.

is ther a rear brake equaliser on the rear axle? this is usually spring operated that pulls up on the rear brake limiter depending on load in vehicle may be stuck in the vehicle loaded position when the vehicle isnt carrying much weight worth a look , just jack up rear end and look for spring device centre of rear axle attached to a device with the brake lines entering/exiting if there get vehicle as high as safe to do then put blocks under rear wheels then slowly lower jack and look to see if the spring device moves down with the vehicle if not this could be the problem as is exerting pressure to rear brakes so causing them to over heat keep me posted

Look beneath the dash panel at brake pedal assembly. You should see the brake light switch, which completes a circuit to brake lights when you step on the brake pedal. Its likely this switch is malfunctioning. The circuit is closed (power to brake lights) when the brake pedal is not depressed. The circuit is suppose to be open (no power to brake lights) when your foot is off the brake pedal. Unplug the wire connector and unscrew to replace this brake light switch.

As for the knocking sound, is it when the vehicle is in motion? Or even when the vehicle is stopped and idling in park?

The battery may not be charging, alternator, cable, or fuse problem.
The brake system may be low on brake fluid. The parking brake switch may be telling the light the parking brake is on.

Sounds like it may be a defective brake fluid level sensor on the master cylinder.

Clean Forward Looking Camera Clean windshield behind the camera cover Inspect Battery Battery & auxiliary battery if applicable, check and correct fluid level; check battery condition using "Midtronics MCR 717" tester. Brake Fluid Brakes and Traction Control Check thickness of front/rear brake pads. Check condition/thickness of front/rear brake discs. Inspect lines and hoses for signs of chafing, leakage or damage. Cooling System Engine cooling system, antifreeze and corrosion protection. Check lines and hoses for signs of chafing or damage. Drive Belt Check condition of poly-V-Belt Drive/Propeller Shaft Inspect condition of flexible disks. Fluids Leakage - Major components. (Underside of vehicle and engine compartment) Check for chafe marks, line routing, damaged components. Hood Check catch, safety catch and hinges on engine hood for proper operation. Lighting and Horns Horn, high beam flasher, hazard warning flashers, turn signals, warning/indicator lamps, illumination, interior/exterior lighting, front/rear lamps. Check trunk/rear cargo area lighting, if applicable Parking Brake System Check parking brake [function test only] Power Steering Fluid Seat Belt Systems Check seat belts and buckles for signs of external damage and proper function. Steering Inspect play of tie rod and drag link joints, inspect rubber boots. Suspension Check condition of front axle ball joints and rubber boots. Suspension Fluid (Active Body Control (ABC)) Tires Check TIREFIT tire sealant expiration date; if equipped Inspect tires for damage and splits, measure tread depth. Correct tire inflation pressure, including spare if equipped. Washer Fluid Wiper Blade Wiper and Washer Systems Windshield wipers/washer system. Headlamp cleaning system and rear window wiper/washer system if applicable. Inspect/Adjust Headlamp Check and correct headlamp setting. Replace Air Filter Element Every 52,000 miles or 4 years. Cabin Air Filter (Combination filter) Every 26,000 miles or 2 years. Engine Oil Oil Filter, Engine Reset Service Reminder Indicators

thanks

the red brake light tells you you are low on fluid or that your parking brake is engaged....the abs light tells you your anti lock braking system is malfunctioning. get the car up to 40mph and SLAM on the brake pedal. the pedal should pulsate and the wheels should as well. if the wheels lock up and you slide to a stop, your antilockbrake system is malfunctioning and you should have a certified mechanic check it out......tires plus and midas both do free brake inspections.......

Hi and welcome to FixYa. I am Kelly.

Here are your service intervals:

NOTE Besides Oil changes there are inspection intervals I & II

http://www.savagebmw.com/Service/content_service_Intervals.htm

Inspection interval I

BMW Inspection I (return to top) Undercarriage

• Change engine oil and filter while engine is at normal operation temperature.
• Check transmission for leaks.
• Check rear axle for leaks.
• Visually check fuel tank, lines, and connections for leaks.
• Check condition, position, and mounting of exhaust system. Examine for leaks.
• Check power steering system for leaks.
• Check overall thickness of front and rear disc brake pads.
• Examine brake disc surfaces.
• Clean brake pad contact points in calipers.
• Grease wheel center hubs.
• Check steering for absence of play, condition of suspension track rods, front axle joints, steering linkage, and joint disc.
• Check front control arm bushing for wear.
• Check brake and clutch system connectors and lines for leaks, damage, and incorrect positioning.
• Check for free movement of the parking brake cables. Adjust parking brake if necessary.
• Check all tire pressures (including spare). Correct if necessary.
• Check condition of tires (outer surfaces (left/right)), tread wear and pattern; In case of uneven tread wear readjust wheel alignment if required.

Engine Compartment

• Read out diagnostic system
• Check engine cooling system/heater hose connections for leaks.
• Check coolant level and antifreeze protection level; add coolant if necessary.
• Check level of brake and clutch fluid in reservoir; add fluid if required.
• Check windshield washer fluid level and antifreeze protection. Fill up and/or correct if necessary.
• Check air conditioner for operation.
• Reset Service Indicator.

Body/Electrical Equipment

• Check battery electrolyte level and add distilled water if required.
• Perform batter load test.
• Check lighting system, i.e. headlights, foglights, parking, backup, license plate, interior (including map reading lights), glove box, flashlight, illuminated makeup mirrors, luggage compartment lights.
• Check instrument panel and dashboard illumination.
• Check all warning/indicator lights, check control.
• Check turn signals, hazard warning flashers, brake lights, horns, headlight dimmer/flasher switch.
• Check wiper and washer system(s); wiper blades, washer jet positions.
• Check condition and function of safety belts.
• Oil hood, trunk/tailgate, and door hinges.
• Grease hood, trunk/tailgate and door latches. Check operation of all latches.
• Check central locking/double lock.
• Replace microfilter or Acc. Cabin Filter.
• Check heater/air conditioner blower, rear window defogger.
• Check rear view mirrors
• Visually examine the SRS airbag units for torn cover, obvious damage or attachment of decals, decorations, or accessories.

Final Inspection

• Road test with check of brakes, suspension, steering, clutch/manual transmission or automatic transmission

Inspection interval II
BMW Inspection II (return to top) Undercarriage

• Change engine oil and filter while engine is at normal operation temperature.
• Check transmission for leaks.
• Check rear axle for leaks.
• Visually check fuel tank, lines, and connections for leaks.
• Check condition, position, and mounting of exhaust system. Examine for leaks.
• Check power steering system for leaks.
• Check overall thickness of front and rear disc brake pads.
• Examine brake disc surfaces.
• Clean brake pad contact points in calipers.
• Grease wheel center hubs.
• Check steering for absence of play, condition of suspension track rods, front axle joints, steering linkage, and joint disc.
• Check front control arm bushing for wear.
• Check brake and clutch system connectors and lines for leaks, damage, and incorrect positioning.
• Check for free movement of the parking brake cables. Adjust parking brake if necessary.
• Check all tire pressures (including spare). Correct if necessary.
• Check condition of tires (outer surfaces (left/right)), tread wear and pattern; In case of uneven tread wear readjust wheel alignment if required.
• Check thickness of parking brake linings.
• Half-shafts; check for leaks at flexible boots.
• Inspect entire body according to terms of rust prevention limited warranty.

Engine Compartment

• Read out diagnostic system
• Check engine cooling system/heater hose connections for leaks.
• Check coolant level and antifreeze protection level; add coolant if necessary.
• Check level of brake and clutch fluid in reservoir; add fluid if required.
• Check windshield washer fluid level and antifreeze protection. Fill up and/or correct if necessary.
• Check air conditioner for operation.
• Reset Service Indicator.
• Replace spark plugs (as applicable by year and model)
• Replace intake air cleaner element.

Body/Electrical Equipment

• Check battery electrolyte level and add distilled water if required.
• Perform batter load test.
• Check lighting system, i.e. headlights, foglights, parking, backup, license plate, interior (including map reading lights), glove box, flashlight, illuminated makeup mirrors, luggage compartment lights.
• Check instrument panel and dashboard illumination.
• Check all warning/indicator lights, check control.
• Check turn signals, hazard warning flashers, brake lights, horns, headlight dimmer/flasher switch.
• Check wiper and washer system(s); wiper blades, washer jet positions.
• Check condition and function of safety belts.
• Oil hood, trunk/tailgate, and door hinges.
• Grease hood, trunk/tailgate and door latches. Check operation of all latches.
• Check central locking/double lock.
• Replace microfilter or Acc Cabin Filter.
• Check heater/air conditioner blower, rear window defogger.
• Check rear view mirrors
• Visually examine the SRS airbag units for torn cover, obvious damage or attachment of decals, decorations, or accessories.

Final Inspection

• Road test with check of brakes, suspension, steering, clutch/manual transmission or automatic transmission

Service indicator lights if installed:

http://www.savagebmw.com/Service/content_service_IntervalsLED.htm

That should just about cover the works other than failures.

Thanks for using FixYa!

Kelly

The green bar is the service indicator bar. The bar shoulld decrease every 1500/2000 km to indicate still how far you can drive before the next service. It will evetually change to yellow and then red. This means the service is overdue. When my 1995 318 went for a service the dealer reset the indicators to full green bars. A week later the bar was in the red. Some computers are prone to this fault due to low ore loss of battery power. Just make sure the physical km of your inspection is still maintained. BMW SERVICE RESET Take a small wire, paperclip, or elect wire and bend like a horseshoe. No light or equipment necessary Open the diagnostic data port, the one were the little pacman centre is located. Turn the ignition to position 2, don?t start. Connect pin7 always first and then pin 19. Hold for 4 seconds. Remove wire and settings will be reset. Warning if you hold the wire longer than 10 seconds you may reset inspection intervals 1 and 2. I?ve done this twice and it definitely work on my E36

How are the brakes acting? This means that you have a brake system malfunction, or that your parking brake is on. 1st thing to check is fluid level. If it's low the light will go on. If it is low, check for leaks. Is your brake pedal low, 'squishy' going to the floor, brakes fading? All of these are system problems. Release the parking brake (even if you don't think it's on, push down on brake release). If it's not adjusted properly, the light can come on. Although it could be a minor problem, don't screw around, find out what's wrong because you may completely lose your brakes next time out. good luck countrycurt0