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Atention!!! Don't disconnect any brake line from caliper! Don't disconnect any ABS sensor! For change front brake pads you must raise vehicle, remove wheels, extract the retaining spring of the caliper, and remove the caliper as follow: 1. Do not disconnect the brake hose from the caliper, and do not allow the caliper to hang by the brake hose! 2. Remove top and bottom caps (on back side of the caliper) for access to guide pins, then unbolt and remove them from the brake carrier. Remove the caliper. 3. Now you must thoroughly clean the brake calipers (free of grease). 4. Remove outer brake pad from brake carrier. 5. Pull inner brake pad out of brake caliper piston. 6. Remove brake carrier from wheel bearing housing (two ribbed bolts). 125 Nm 7. Remove brake disc from wheel hub. 8. Install brake carrier on wheel bearing housing. Tightening torque for two ribbed bolts = 125 Nm. 9. Check up the brake fluid level on the reservor, and emptying if neccessary! 10. Push piston back into brake caliper housing. 11. Install inner brake pad (with expanding spring) in brake caliper piston. (Arrow marked on pad - if exist, must point in direction of brake disc rotation when vehicle is moving forward). 12. Install outer brake pad into brake carrier. 13. Bolt brake caliper housing to brake carrier using two guide pins. Tightening torque is 25 Nm. 14. Install both caps. 15. Insert retaining spring into brake caliper housing. Important: Depress the brake pedal firmly several times while the car is stationary so that the brake pads adjust to their normal operating positions!!! Check brake fluid level and top up if neccessary!!!
It is not wheel wobble but vibration from the front brakes. The front brake rotors have worn unevenly (known as disc thickness variation - DTV) and when this occurs you will get vibration from the front rotors as you apply the brakes and it is especially noticeable when braking on down hill runs. DTV is usually caused by poor alignment of the rotors on the hub. In other words sloppy installation procedures.
You will need to replace both the rotors and brake pads on the front and make sure the business that does the work properly checks the rotor for run out.
Check your tires for busted belts in tread! you will notice a bubble in the tread if the belts have come apart! Next check your lugnuts to insure they are tight! If they are, next you should check for warped rotors (Disc brake)! With the description of a wobble at any speed, sounds more like bad tires though!!!
Brake discs do not warp though unless the brake disc is running true to a very fine tolerance (max 0.004") it will resemble a wobble plate and the brake pads will wear off the high parts resulting in a disc of varying thickness.
Tight caliper operation will prevent the piston(s) moving back the correct 0.002" to prevent rubbing when the brake is not being used.
A brake that runs hot due to constant rubbing does tend to shorten the life of the hub bearing.
Lift the caliper piston dust cover and use a strong light to examine the piston. Overhaul or replace the caliper if the piston doesn't appear completely clean and shiny.
Check the (fitted) disc runout with a dial gauge and keep cleaning the mounting faces until the runout is better than 0.004".
Check ball joints and track rod inner and outer ends for free play, suspension joint condition and shock absorbers for security, leaks and effectiveness. Check the tyres for bulges, etc. and wheels for excess runout...
As a first course of action I strongly suggest that you have the hub nut tightened. If it's loosen, it may shake even not braking. Very dangerous so please have it checked and tightened.
Hope this helps and thank you for using FixYa! Have a good one!
Assuming all lug nuts are tight, there could be several problems causing the wobble/dragging sound.
Bad bearing - a bad bearing will grind and vibrate
Bad ball joint - a bad ball joint will cause wobbling of the wheel.
This is a potentially serious problem and should be looked at immediately. Without knowing more (improper tire wear, shudder when applying brakes) one of the above is the most likely cause of your problem. You'd do well to have the wheels pulls and examined right away.
Raise and support the front of the vehicle on jackstands. Remove the front wheels.
Remove the caliper assembly; do not let the caliper assembly hang by the brake hose, instead support it with a piece of wire looped around the front spring or control arm.
Remove the retaining screw from the brake rotor and remove the rotor from the hub.
An impact driver, No. 3 phillips screwdriver bit, and a hammer may be needed to remove the retaining screw. It is fairly easy to destroy the screw slots using an ordinary phillips screwdriver to remove the tightly driven screw (see photo).
To install the disc, replace the disc on the hub, screw in the retaining screw and replace the caliper assembly.
Disconnect the caliper from the caliper bracket. Support the caliper out of the way with a length of wire. Do not allow the caliper to hang from the brake hose.
Remove the caliper bracket.
Remove the two 6mm screws and the brake disc. If the brake disc is difficult to remove, install two 8mm bolts into the threaded holes and tighten them evenly to prevent cocking the rotor.
Install the rotor in position. Install the two 6mm retaining screws.
Install the brake caliper. Install the tire and wheel assembly.
Disconnect the caliper from the caliper bracket. Support the caliper out of the way with a length of wire. Do not allow the caliper to hang from the brake hose.
Remove the caliper bracket.
Remove the two 6mm screws and the brake disc. If the brake disc is difficult to remove, install two 8mm bolts into the threaded holes and tighten them evenly to prevent cocking the rotor.
Install the rotor in position. Install the two 6mm retaining screws.
Install the brake caliper. Install the tire and wheel assembly.
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