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Back disc brake keeps locking up on76 harley - Harley Davidson Motorcycles

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Here's a "how-to" with some pics:

Go pass the saddle bags in the article.

Posted on Oct 13, 2013


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Front brake locks up on its own while riding, then releases after bleeder is opened. Why?

Hi, James your front caliper may be contaminated not allowing the pistons to move freely I suggest you take it apart for inspection dress pistons and bores if scuffed with 600 grit wet/dry sandpaper clean everything with Brake Kleen and install a new seal kit for this scenario you will need your service/owners manual if you can not find the first and best tool you ever bought for your Harley, despair not, for a mere $5 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at Good luck and have a nice day.
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Aug 29, 2016 | 2007 Harley Davidson FXSTD Softail Deuce

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Back disc brake keeps locking up on 76 harley

on my 75 flah I would clean the disc with toothpaste that would take the glaze offalso I would either separate the have of the caliperand clean around the Pok with brake clean and no toothbrush and make sure that the part comes out every tracks don't push too hard are your pop it out of its socket also water can get the in the master cylinder being down low under the rubber bootmoves freely the piston inside the master cylinder mine would get water under the booth and cause it to hang up these are the areas to check clean and make sure they work well

Oct 13, 2013 | 1993 Harley Davidson FXR Super Glide

1 Answer

Why would the back brakes lock up on a 92 fxr lowrider

Sounds like caliper seized. Remove, clean, rebuild, and bleed the old brake fluid making sure to use what Harley recommends. If you don't want to rebuild, you can buy a new one fairly cheap, then bleed the air and old brake fluid out.

Apr 07, 2013 | Harley Davidson Motorcycles

1 Answer

My 2001 harley davidson fxdl dyna low rider's front brake pads drag

your brake disc is bent or the old brake pad worn to the metal and has spoilt the disc , is either you resurface disc or replace the disc.

Jun 28, 2012 | 2001 Harley Davidson FXDL Dyna Low Rider

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My insignia hand brake has locked on how do i release rear offside only

you need to take off the rear wheel and there is a hand brake hole in the drum on the disc. you locate the hole with the adjuster.. make sure the hand brake is not on. the leaver for the hand brake take the cable off if the brake is locked the leave will let you take it off. then get a peace of wood and put it on the leaver and hit it back with hammer on the wood not the leaver. then take the screw out for the locator of the disc. and hit the disc with rubber or plastic hammer going round the disc. not to hard just to get it to move when of find out why the hand brake is locked in the first place. ( prob be the shoe's pins ) change the parts. while parts off give good clean and put some copper grease on the parts that move. huck back up the cable and check disc drum part for damage. screw the adjuster back down and refit. when disc back on adjust the brake with the hole lined up and move back and forth until the brake is locked then turn back one point on the adjuster check the disc turns and then use the hand brake. if still an bit hard to move after hand brake off nock the adjuster back down one more and test again. if all well put wheel back on.

Jun 04, 2012 | 2003 Vauxhall Vectra

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Front brake does not completely disengage. lever is lax, brake light stays on. fluid level ok.

Are you sure the brake is not releasing? Disc brake pads do not pull back from the disc like drum brake shoes pull back from the drum. They hold a slight contact with the disc to keep dirt and water off the disc and the pads. That's why disc brakes work so much better than drum brakes in wet conditions. I suspect that your brake lever and the pivot pin are worn and need replacing. How much up and down movement does the lever have? The plunger in the brake master cylinder pushes the lever back but the lever operates the front brake light switch. If the lever and it's pivot pin are worn, the lever will not come back far enough to depress the switch.

Good Luck

Aug 31, 2011 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

Cannot figure out if my daughters 1996 MX6LS/MEdition has disc brakes or ABS breaks. How can I tell Thanks

Disc brakes and ABS are two totally different things. ABS is a computer system that keeps the brakes from locking up on you. Disc brakes are a type of brake system. The front are disc brakes and the rears are either disc or drum brakes.

Nov 18, 2010 | 1996 Mazda MX-6

1 Answer

Rear brake will not keep its prime

a bent disc or bad wheel bearing can push the pads back, and you need to pump it for the brakes to work, or it requires a seal kit in the rear brake master cylnder

Apr 26, 2010 | 2003 Harley Davidson FXSTS Springer...

1 Answer

2004 electra glide classic front brakes locking up.tried another master cylinder and replaced fluid with new.what else could be causing it.

By "locked up", I'm assuming that once you release the front brake lever, the bike will not roll. As with all disc brakes, the brake pads do not withdraw away from the disc. They maintain light pressure on the disc to keep it clean and dry. When you pull the lever, they apply stopping force. When you relaese the lever the force is releaved but the pads still stay in contact with disc lightly and the wheel will turn.

If you've tired another master cylinder and the brakes are still locking up, there is something wrong with either the hose or the caliper itself. Usually, it's the caliper. You must take the caliper off and use compressed air to get the piston out. You must be very careful while doing this. If you must use high air pressure, the piston will come out of the caliper with extreme force. I use a small air pressure regulator to slowly increase the pressure starting at about five psi.

If you get to 25 psi or better, things can get dangerous. At this point, I quit using air pressure and go to a grease gun. By taking the end off the end of the hose on the grease gun, it will screw right into the place where the brake line goes most of the time. Now pump the grease in until the piston pops out. It's a nasty job but a lot safer than the air pressure method. Clean the caliper up completely free of grease. Use a wheel cylinder hone to hone the inside of the caliper's piston bore. Pay particular attention to the groove where the caliper top seal goes in. Lubritcate the piston and the inside of the piston bore of the caliper with the proper type of clean brake fluid and press the piston into the bore. The caliper is now ready to reinstall. Make sure you are using the proper type of brake fluid. Harley changed back to DOT 4 brake fluid but I can't remember what year. It should be on the top of the master cylinder cover. Do not mix DOT4 and DOT 5.

I have on a few occasions seen a rubber brake hose that would not allow the brekes to release. They get damaged on the inside. The very high pressure present when you apply the brakes can get past an obstrucion on the inside of the hose. But, once you release the pressure, as the pressure lowers, it gets to a point where it cannot get past the obstruction and thus holds this amount of pressure on the caliper. Replace the brake hose.

Make sure you bleed all the air out of the system. If you leave any in there, as the air heats up, it expands and applies pressure to the brakes and makes them drag. Alweys test the brakes before riidng the bike. Improperly serviced brakes can cause serious injury or death. Good Luck, Steve

Apr 25, 2010 | 2004 Harley Davidson FLHT - FLHTI Electra...

1 Answer


The rear brake of the Sportster is a simple hydraulic disc brake consisting of a master cylinder, brake hoses, and a disc brake caliper. My suggestion it that you purchase an original H-D service manual but a Clymer's manual will show you this part. Do an online search for "harley service manual". or are two good sources.

Good Luck

Apr 23, 2010 | 1993 Harley Davidson XLH Sportster 883

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