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proportional valves are designed to give the right amount of hydraulic pressure to the back brake to prevent them locking up with a resultant loss of control of the vehicle
replacement of calipers would only be need once to fix jammed or leaking pistons but the pads may have to be replaced more often.
if it only the front brakes that is the problem ,I suspect that the fault will be in the compensating ports of the master cylinder that is not releasing the fluid back into the reservoir and the resultant heat build up from the pads still in contact with the discs is building up brake pressure and so keeping the pads on the discs to the point where lock up is evident
failed proportioning valves will result in no brake action to the rear wheels or rear wheel lock up
If parts are not available from the manufacturer spares department, they should be still be available from reputable brake shops as car manufacturers do not make brake parts as such but rely on brake manufacturers to supply items to specifications
the unit will be repairable by an accredited shop and failing that would be available from the wreckers.
i would have the rear brake limiter mechanism checked first as this device regulates brake pressure so it is equal to both back wheels, if this is ok i'd check that the wheel cylinders aren't sticking and that the brake shoe assembly has been replaced properly
Hi, what you feel is your anti-lock brake actuator pumping the brakes. This is probably due to dirty/dusty or improperly adjusted brake shoes causing the rear brakes to lock. It is also possible that you have a leak in one or both rear brake cylinders. Have your rear brakes checked, cleaned, and adjusted. If you would like to do it yourself, I can provide instructions--just let me know.
frozen or engaged parking brake cable or possible bad brake hose but that would cause both to lock is the other wheel cylinder leaking? that would releave pressure from the wheel . a fluid leak (axle seal or cylinder) can cause the locking feeling because it slips then catches when the fluid wears off hope this helps
since the new pads are alot thicker than the old ones,the brake needs to be set properly.
something is not right for sure.
the retainer for the park brake cable may be not in the right spot.there is two places it can fit.