Question about 1979 Harley Davidson XLH 1000 Sportster

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Back brake every time I use my back brake it locks up on me and I have to bust the bleeder value on it i have rebuilt the master cyclinders, calibers and still doing it

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  • Harley Davidson Master
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The master cylinder is binding not allowing full return if you still have oressure on brakes. Hoses sometimes seperate and cause a flapper effect closing of t ge hose in one direction.. In this case, maybe in the return direction of flow. Reco,mmend changinging brake hose at rear brake. Good luck and be safe.

Posted on May 27, 2009

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Brake system all new but pedal goes to the floor


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1994 Chevy Cavalier front right brake is locking up every time you step on brake . I already changed that caliber and it is still doing it


MOST OF THE TIME WHEN A CALIBER LOCKS UP: IT IS NOT BECAUSE OF THE CALIBER BEING BAD. THE CAUSE IS THE RUBBER BRAKE LINE GOING TO THE CALIBER IS BAD INSIDE OF THE RUBBER HOSE. ONCE YOU PRESS THE BRAKE PEDAL YOU PUSH FLUID INTO THE CALIBER ONCE YOU RELEASE THE PEDAL THE FLUID DOES NOT ALL RETURN TO THE MASTER CYL. THE HOSE IS OLD AND THE RUBBER IS BUSTED INSIDE OF THE HOSE AND THE FLUID IS STAYING INSIDE OF HOSE AND HOLDING PRESSURE ON THE CALIBER. I HAVE HAD THIS HAPPEN TO ME AND NEEDLESS TO SAY IT COST ME AROUND $500.00 TO HAVE IT FIXED AFTER I REPLACED CALIBER, ROTOR AND BRAKES.

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I have a 1997 chevy cavalier. I replaced wheel cylinders, brake lines, front calibers master cylinder and booster. When I bleed the brakes I only get brake fluid from the front bleeder on the ABS system. I...


sometimes if you leave the bleeder screw open it will gravity bleed the cylinder.Make sure master cyl is full and do one wheel at a time.I have seen this work, I have done it.

Nov 16, 2010 | 1997 Chevrolet Cavalier

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2001 Vulcan front brakes. Left caliper keeps locking up. Have rebuilt master cyl, replaces left caliper, replaced brake lines left and right.


When you rebuilt your master cylinder did you look down the reservoir to the large brake fluid feeder hole? Right next to it is a tiny pin hole. That is the brake fluid return hole for the reservoir. It is probably plugged with rust or dirt. When it is plugged , you drive a short distance and the wheel locks up. Open the bleeder screw to release a squirt of fluid and you can drive back home before it locks up again. Clean out the hole with a single straight bristle from a wire brush and see if that fixes the problem.

Oct 01, 2010 | 2001 kawasaki VN 750 Vulcan

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When riding brakes slowly lock up till bike will not move. lossen front bleeder eveything opens up. I have rebuilt the master clynder and flused all lines front and back and replaced all the brake fluid....


i have had somebody with the same problem on a different bike, and he had rebuilt the master cylinder and he had put a seal in the wrong way round / upside down and that had caused his brakes to lock up solid maybe check you master cylinder ,make sure all seals etc are in correct.

Mar 28, 2010 | 1984 Honda GL 1200 Aspencade Gold Wing

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05 chevy classic malibu do brakes need to be bled completely to change pads or just enough to compress piston and where is location of bleeder valve


You do not have to bleed them at all. Remove the cap off the master cylinder and you can then compress the caliber to remove the old pads and install new ones. No need to belled unless you replace the master cylinder or a caliber.

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No brakes after master cyclinder and booster replacment


To bleed the brake system open all the bleeders and let the system gravity bleed for @ 1/2 hour ensuring the master stays full. Then close all bleeders and starting furthest from the master (r/r) have someone pump the brakes 2-3 times,hold the pedal down, then open the bleeder,close the bleeder,and repeat untill there are no air bubbles and the brake fluid is running clear .Repeat for all wheels in this order R/R L/R R/F L/F ensuring master cykinder does not run empty. You cannot pump the pedal with a bleeder open you will be sucking air back into the system. Once you finish all wheels repeat to ensure there is no air remaining in system.

Apr 17, 2009 | Toyota Pickup Cars & Trucks

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Bleeding the brakes


have someone pump the brakes manually inside the car and the start opening the bleeder screw one at a time starting farthest away from the master cylinder. They must pump about 3-4 times and hold then you open the bleeder while they are holding the brakes. May take a few tries before fluid comes out.

Nov 16, 2008 | 1995 Pontiac Sunfire

1 Answer

I just put new calipers on my jeep and anew master cyclinder when i pump the brakes and bleed the front calipers and release the pedal the fluid leeks back into the master cyclinder


Did u bleed the master cylinder before u installed it? If not, you'll have to also bleed the rear brakes. starting w/ the bleeder the farthest away, to next greatest distance,etc til u get to the closest bleeder.
If u did bleed the master cyl. before installation, I'm wondering if u did the following:
have someone pump the brakes (3 times, don't mash the pedal to the floor, just gentle push no more than half way down 3 times, while holding pedal half way down 3rd pump, open bleeder, when fluid or air slows coming out, close bleeder, and repeat, until only clean fluid flows. And of course, don't let the fluid get too low in the master cyl, or you will **** in air and have to start all over. Let me know how you do. countrycurt0

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