Question about 1993 Harley Davidson FXR Super Glide

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Rear brakes lock up

Sometimes when i put on the brakes the rear brakes lock up. this doesnt always happen but i need to fix it. i already replaced the master cylinder and changed the fluid. can anybody help me?

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  • Gar
    Gar May 11, 2010

    Is the caliper excessively hot when this happens? Are the brakes dragging?



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The most likely problem will be the rubber line coming from the splitter leading to the caliper. With age these get soft inside allowing fluid to pass one way easily but not the other. Remove this line and blow through it both ways to insure the fluid can pass both ways. If needed check the line from the master cylinder to the splitter as well.

Posted on Jun 29, 2009


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2 Answers

Brake system failure

I think brake proportional Valve (or Brake pressure regulator) which usually a part of Master cylinder is suspicious.
It regulates pressure to Front and Rear brake line.

If I were you, I try to draw air from Master-cylinder side (not Caliper side).
(Bleed from connector between Master-cylinder and pipe, same way as caliper. someone keep pushing brake then you lose connector then tight. Don't forget to put towel under master cylinder to catch brake fluid)
If air trapped in Proportional valve (pressure regulator), pressure won't relay to rear brake line but only front side.
Front has two separate line from master cylinder (right and left) but rear goes in one line from master cylinder then separate at rear.

Did you noticed both rear brake dragged when it's hot day ?
Because when air get hot, air expand and pushes to caliper and drag but not respond to your pedal.
(calipers don't respond when you push pedal, but it's pushes calipers by itself even you are not pushing pedal, when it's hot because air expand)
Sometimes, seal get old and lose pressure for only one side (front or rear).

if this happened after you did brake job, or you notice your brake was vapor locked (too much brake on hot day then brake fluid boiled), maybe air bleed and whole fluid change may solve.
if you didn't have any unusual activity but it gradually losing pressure to rear, I suspect master cylinder (proportional valve seal).

Sorry I don't have exact e46 master cylinder diagram but basic diagram, hope you can understand what I am talking about.
Picture shows "leak" but this case "Air" in somewhere in pink.
or lose seal on rear piston.


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1999 toyota 4 runner rear tires (brakes) keep locking up. they do not lock up in reverse, but when i put it into drive i have to give it a lot of gas before they "break free" then they are fine, but

May I ask-- what in detail -- was done by these professionals?

How would it even be possible-- they found nothing?

Sounds like the parking cables, are rusted inside
& need to be replaced

At this point-- I would do all your own work

Instead of asking questions-- get it apart & verify your thoughts

Brakes replace ,RECENTLY, nothing funny there ??

Sloppy work & money spent-- so you now have bought a problem
--not there before?

If a shop can't do brake work-- they need to go out of business

Does your master cylinder--know if your going forward or backwards,don't think so

Locked up parking pivot--you just had someone in there,
so they did nothing or caused that also?

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