SOURCE: anti lock brakes
Brake system warning lights illuminate to alert the driver to various brake system conditions and are usually located on the instument cluster.
Each time the vehicle is started, the ABS control module performs a diagnostic self-check of the ABS system. During this self-check the ABS warning light in the dash panel insert will illuminate for a short period of time . After the self-check has completed the ABS warning light will go out.
If a malfunction is detected within the anti-lock braking system during the diagnostic self-check, the ABS warning light will illuminate and remain ON and ABS will be turned OFF, until the cause of the malfunction is repaired. How ever the conventional braking system will remain fully operational.
The brake warning light will illuminate if the brake fluid level becomes low or if the parking brake is engaged.
Hope that helps...........
SOURCE: 1993 Nissan 300zx Brake lights don't work
brake pedal switch defective. Replace or adjust switch.
SOURCE: anti lock brakes
Well this is very serious I hope you deal with it right away. You mentioned that sometimes the pedal was hard,do you mean that its all the way up and it doesnt feel like you have power brakes?? If so have you noticed any sounds like air escaping (swoosh sound when brakes applied)? Failure of the power booster causes pedal to become very hard and could possibly be your problem for hard pedal if I understood you correctly. check to make sure that vacuum to the booster is conected properly and hose not kinked..Now for the solution for the pedal fading to the floor... You either have air in your brake system, A bypassing master cylinder , or a hydraulic leak...Were your brakes serviced recently?? if so try bleeding your brake system first...That would be the first step if still the problem persist I would isolate exactly where the problem was coming from.. To do this you would start at the passenger rear wheel and line clamp the brake hose to make that part of your brake sytem inoperable...when clamped try your brakes and note if brakes improved or had know affect on system (when testing obviously im not suggesting you drive to determine results of test procedure)repeat test for each wheel you have isolated the problem when brakes feel normal with one wheel clamped,which ever it may be.. This isnt as hard as it might soun and if you are confused at all dont hesitate to ask questions... Remember the only dumb question is the one you fail to ask I would hate for you to get into an accident ... Good luck!!!
SOURCE: Hissing sound from brake pedal of Renault Scenic 2001
Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.
SOURCE: Brake lights stick while driving but turn off when pressing brake
CHECK YOUR BRAKE LIGHT SWITCH THAT IS ON YOUR BRAKE PEDAL UNDER THE DASH
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