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Air in the system is what usually causes a caliper to lock up when everything else is functioning properly. If you can't get the air out of the system you will continue to have issues because when the brake system starts getting hot, the air expands inside the brake system causing the weakest brake to be applied. You will need to bleed the brakes once you fix the caliper that is not able to be bled. Remember, bleed the brakes from the farthest wheel from the master cylinder first and then continue to the nearest wheel last.
May not be adjusted right. Is there a slight drag spin rear wheel off the ground? If not there is an adjuster behind wheel. Or some cars you can take adjustment up by using the e brake a few times...
No.
1. But if the inner and outer brake pads have been installed incorrectly (such as being reversed) the brakes will lock up.
2. If the caliper is bad and the pistons will not retract back into the caliper when the brake pressure is released the pads will lock onto the brake rotor.
3. If the caliper is frozen on the slide pins due to poor and incorrect lubrication of the slides you will also have a problem with brake lock up.
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.
Need year make and model. In most newer vehicles the valve is located in the master cylinder. It will not normally lock up the front wheels. It usually controls one front and one rear wheel at a time in the event of a brake fluid loss. If front calipers are locking up you could have seized caliper pistons/slide assemblies. The flex hoses may be deterioated internally due to contaminated brake fluid or the master cylinder may be defective
if the proportioning clogs or damaged it can cause brake problems such as yours take pressure readings on all 4 calipers the proportioning valve is just as it says differentiates the pressure front to back also the abs unit itself can cause the same problem also
It could be a proportioning valve, and there's also the chance that the portion of the master cylinder that operates the front brakes is going bad. Have you had a pressure check done on the front brake system? Also, some vehicles have a variable proportioning valve, so that when the vehicle is loaded, it allows more pressure to the rear brakes. These can sometimes stick in place, causing the fault that you describe. Hope this helps you out.
Most likely the free play required between the brake pedal and the debooster you replaced.
If all 4 brakes drag,
it can not be anything else, ensure the brake deboost has clearance, between the master cylinder. not partly acitivated already and pushed the master cylinder in slightly. Always look what you did previously and when the problem occurred. Brake pedal to debooster, or debooster to master cylinder both must have some clearance.
check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain
My guess would be a defective proportioning valve. Good luck
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