1994 K75S Rear Disk Brake Pedal Play

Slipster · May 26, 2014

I understand that a certain amount of play is necessary on the the rear brake pedal and is a good thing. My issue is a little too much play and would like to take about a 1/2" of travel out so to engage the brake just a little higher to the foot.

I have adjusted the one screw on the pedal itself to raise it up some. New stainless lines and fluid. Brakes work great no further bleeding needed. Is there another point of adjustment on the rear brake?

dieselyoda · May 26, 2014

What's your total travel? Are you concerned with the amount standing still or while moving? Do you have ABS?

roncooper · May 26, 2014

On my 91 75RT ABS the link between the pedal and the cylinder is adjustable. I would suggest 14mm or so free travel measured at the end of the pedal.

I had mine tighter for a while and the brake would drag.

kentuvman · May 26, 2014

I had an interesting issue when I tightened my rear break pedal - while riding through Glacier National Park I noticed the brake was engaging at a high altitude - seemed the high altitude affected the pressure in the line. When I got home, I increased the pedal play.

dieselyoda · May 26, 2014

That's an odd comment and worth thinking about.

kentuvman said:
I had an interesting issue when I tightened my rear break pedal - while riding through Glacier National Park I noticed the brake was engaging at a high altitude - seemed the high altitude affected the pressure in the line. When I got home, I increased the pedal play.

I don't want to hijack the original post so maybe post your comment as a new thread? I would like to understand what you described.

98lee · May 26, 2014

If you adjust the pedal so that there is no freeplay between the rod and the piston ( there is a spec.) you run the risk of holding the piston in past the bleed back hole in the cylinder which will cause the brake to drag.

I can see how, if it's adjusted too close, the lower atmospheric pressure at altitude, on the line and the outside of the caliper piston seal might not force the master piston to return as far, leaving the bleed back port covered.

:dance

dieselyoda · May 26, 2014

98lee said:
If you adjust the pedal so that there is no freeplay between the rod and the piston ( there is a spec.) you run the risk of holding the piston in past the bleed back hole in the cylinder which will cause the brake to drag.

I can see how, if it's adjusted too close, the lower atmospheric pressure at altitude, on the line and the outside of the caliper piston seal might not force the master piston to return as far, leaving the bleed back port covered.

But that would also imply the first time the fluid got hot, the brake would grab?

Slipster · Jun 4, 2014

Thanks to all :bow

Measure at 14mm so I left it alone following your advice

1994 K75S Rear Disk Brake Pedal Play

Slipster

Slipster

dieselyoda

Active member

roncooper

New member

kentuvman

New member

dieselyoda

Active member

98lee

3 Red Bricks

dieselyoda

Active member

Slipster

Slipster

Similar threads

Forum statistics

Share this page