Soft rear brake after recall

[bcar00]

Here's a crazy thought: Has anyone noticed the hill hold function having an effect on rear brake softness? Might be total coincidence, but I had great rear brakes until the week after the first time I tried Hill Hold. Took a long ride yesterday after pumping up the rear brakes and they went soft again after using hill hold.

I know correlation isn't causation, but Hill Hold does manipulate the rear brakes, right? For the owners who have had great luck with the warranty brake fix, do you use hill hold?

 

[Kiwicol]

I use hill hold occasionally & my rear brake is ok.

 

[Einar]

Does the service manual change by year? My 2021 GT manual doesn't have any of those phrases, and the only procedure for bleeding after an ABS Modulator service is a standard bleeding of the front and rear brakes. Nothing at all for bleeding the high point of the system (Modulator).

The online service manual has it, as does the searchable PDF download of the service manual on this website under Resources. It's first mentioned on page 1,075 of the PDF.

 

[Dr.D]

I had the recall lager module put in and was fine for about a year or better but now it is returning. It does pump up with one push of the pedal but it’s still not right.

 

[Tal]

Here's a crazy thought: Has anyone noticed the hill hold function having an effect on rear brake softness? Might be total coincidence, but I had great rear brakes until the week after the first time I tried Hill Hold. Took a long ride yesterday after pumping up the rear brakes and they went soft again after using hill hold.

I know correlation isn't causation, but Hill Hold does manipulate the rear brakes, right? For the owners who have had great luck with the warranty brake fix, do you use hill hold?

...good point...after reading what you have said i have disabled the hill hold to see if it helps....air is getting into the brake line from somewhere ...could be there..

 

[stingray]

The air does seem to collect at the abs modulator. I'm not sure it comes from there or is just naturally occurring air that is released from the brake fluid collecting at the high point. Seems like a leak big enough to allow air into the system would also leak brake fluid out when under pressure of braking pressure. Using the procedure of "replacing the abs modulator" to push the air back to the master cylinder before bleeding to the caliper seems to be the best way of getting the air out. Most bikes accomplish that through regular geometry, bubbles rising to the master cylinder to be released. Our air gets trapped in the system until forced out. Seems to be a design flaw.