ABS - REAR BRAKE PEDAL LOCK-UP

[Bernard Vinet]

I am not sure what the cause or remedy for this.
After riding some of the highest Colorado passes my rear ABS started activating on routine stops. Thinking it was air in the lines, I bled both front and rear brakes - the old fashion way and with no DealerTool.

The brakes worked good - for awhile. Ever since, intermittently and without warning, when applying my rear brakes the pedal locks up! Applying much additional foot pressure, they still do not fully activate.

This has caused me several pucker moments at higher speeds, both when busting twisties and once while following some mates passing a vehicle ahead which required some sharp slowing for the next vehicle and motors ahead of me.

My rear brakes will work properly for a few hours and then lock.
There is no warning and I never know when the pedal will suddenly lock-up!
I purchased the DealerTool and have bled both front and rear with it several times, following the manual procedure close as possible. The issue persists and had obviously adversely affected my spirited riding.

Suggestions and/or comments welcome . . .

If your brakes do lock up its probably a sensor on the wheel or a wire that when you hit a bump at a certain angle it locks your brake. not an expert but this makes some kind of sense. Other thing your master cylinder does not release pressure completely and it just builds up and eventually locks up. Maybe

 

[1olbull]

If your brakes do lock up its probably a sensor on the wheel or a wire that when you hit a bump at a certain angle it locks your brake. not an expert but this makes some kind of sense. Other thing your master cylinder does not release pressure completely and it just builds up and eventually locks up. Maybe

Thank you!
I shall look into this.
I'm finding the ABS crap is expensive?!

 

[Ygransom]

If the brake is locking up i.e. pads don't release wheel doesn't turn it's the hydraulic system, if it's the pedal not moving sounds mechanical.

 

[sonny]

It may sound a bit out in left field but when was the last time you checked the thickness of the brake rotor? If you have 30,000 plus and have been using the high dollar brake pads the brake rotor may be out of tolerance. Not sure how the ABS would react to a worn out rotor but it might be worth checking out.