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I have a 79 FLH and have a new caliper with a new line and rebuilt master cylinder. Breaks have been bled and feel good but when I take for a ride, the back brake locks up. Can anyone help with this

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Keep bleeding ---and observe operation of caliper make sure guides not sticking and operating correctly new doesnt mean free from defects

Posted on May 11, 2017

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2 Answers

02 Ford Explorer sporttrac xlt. New rotors calipers pads and master cylinder. Bled it twice stream looks good new fluid. One day breaks stick then the next no breaks Break light on Proportional valve?


For some reason these vehicles you need to bleed brakes several times, had same problem, so air hangs up in lines somewhere it apears. When you say brakes sticks, describe it better, locked up, or dragging on rotors?
CERACOAT-NANOTECH.com

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2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

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Brake pedal goes nearly to floor front pads, calipers, brake hoses changed, rotors turned Master cylinder changed, brake booster check valve changed rear brakes checked, drums good no ridge, shoe's...


I would go with not bled correctly

The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake

Sep 16, 2011 | Saturn SC Cars & Trucks

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Just replaced rotors, calipers, caliper brackets, and pads. Bled all four wheels, starting with the farthest away from the master cylinder working my way to the closest. Brake pedal feels firm when car...


Bleed with the car running and make sure all the air is out. Now make sure there is no leak and the pad contact are adjusted without much gap so that the calipers hold on. make sure the servo assist is correct, if so and the master cylinder was set right , it must work. Please recheck all your work once again to trim up.

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I replaced a master cylinder on a 2001 taurus and bench bled the master cylinder before putting it on the car. then bled the 2 lines at the master cylinder and i am getting air out of the front line on...


try disconnecting the front line, have someone else then step on the brake pedal and hold it down while you re-install the line. If that doesn't do it, you probably did get a defective master cylinder.

Mar 07, 2010 | 2001 Ford Taurus

1 Answer

Pistons in both front calipers stay out, both calipers replaced


You may have a leak in the booster or master cylinder. You can put a pressure tester on the system to test for leaks. It does sound like you have an air leak.
You can try to bleed the master cylinder, then slave cylinder, then brake lines.

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Brakes


this is a hydra boost system and recieves boost from the power steering pump. If you flow rate is low on the pump chances are the pump is going bad.

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