If fluid leaking from the master cylinder finds a way into the servo or booster it could cause an entirely different sort of trouble. Master cylinders are usually very reliable unless contamination of the fluid has taken place - usually indicated by a darker than usual fluid colour and sediment in the reservoir, evidenced when a strong light is used.
A loss of brake pressure could signal the master cylinder is failing (the pedal creeping towards the floor) or a brake booster problem, perhaps caused by insufficient vacuum or an air leak. An assistant is useful when looking for such problems and also when searching for noises.
The steady clunk being felt on the brake pedal might be something fairly obvious like a wheel balance weight just touching a caliper when the brake is applied. It is time to become a detective - I recently had one of those. One wheel had a second row of balance weights that caused no problems until I fitted new brake pads.
If a close and careful examination and a vigorous shake of everything by an assistant provides no clues, it could be worth checking the air gap between the ABS sensor(s) and the reluctors if they are the exposed type. Sometimes corrosion reduces the diameter of the reluctor and increases the air gap so the signal is lost at low speed. The ABS brain thinks the wheel is not turning and tries to operate the ABS on that wheel. Usually not a steady clunk but you never know, it could be worth checking...
SOURCE: 1998 au falcon automatic transmission, car wont start in park
check the neutral safety switch, sounds like it needs to be replaced. countrcurt0
SOURCE: ABS braking
have you check? the master cylinder. sometine when you get the rotors cut they dont come out right because they may be warped or to thin. if you did the job yourself you might have put the calipers in on the wrong side. this happens alot . if your rotors front and rear are fine then switch the calipers to the other side.
SOURCE: 2002 clunking problm
Check the macpherson struts to ensure they are not loose. One way to check is visually in the engine compartment. Check the top of the struts to ensure the nuts are not loose. Another is to raise the side of the van where you hear the clunk. Raise it so the wheel is off the ground. Grasp and shake the strut to see if it is loose. The struts should not be loose, but you never know. As the strut is certainly ivnolved in bumps and rotates when the wheel turns, I would check there since you have already explored the bushings and links.
SOURCE: brake pedel pushes to the floor
pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.
SOURCE: i have a 2002 ba falcon my abs light comes on and
The wheel bearing needs to be replaced (hub assembly) Its dangerous.
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