What I have: I have Jamar disc brakes on all four corners - 4-piston on the rear, 2-piston on the front. Master cylinders are Wilwood 3/4-inch bore, split (front/rear) master cylinders, reverse swing with remote reservoirs.
Issue: If my car sits for an extended period of time (the last time I drove the car was at the Night Run August 19th) I lose firmness in the pedal. While the brakes work for the most part, the pedal goes almost all the way to the floor. I bleed the brakes (using a Motive Products pressure bleeder) and the pedal comes back (I bleed both front and rear - both systems, as it seems to effect both. I have completely inspected all junctions, joints, calipers, and cylinders and find no evidence of leakage. What should I check next? Any ideas about what is going on?
Brakes going soft
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- Posts: 17756
- Joined: Mon Nov 13, 2006 10:17 pm
Re: Brakes going soft
I had that problem once; couldn't figure it out but it turned out that one of the flairs I had made was slowly allowing air into the system. No leak showed but after sitting for a long time everything would go south, just like you said. I took the brake system apart to replace the turning brake hancles and cylinders then, when the system was re-connected up it never let air in again. One of the things I did when reconnecting that joint was to carefully align the brake line so it saw level when tightening things up. The nearest thing I can think of is that the tube join to the cylinder's brass adapter might have been at a slight angle so the contact area was off just enough. Go figure!
Lee
My opinion is worth slightly less than what you paid for it.
My opinion is worth slightly less than what you paid for it.
- bajaherbie
- Posts: 9959
- Joined: Sat Jul 15, 2006 7:07 pm
Re: Brakes going soft
Have your wife pump the brakes every day. I am sure she will go for that!
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- chuckput
- Posts: 441
- Joined: Thu Sep 05, 2013 8:01 pm
Re: Brakes going soft
Or. . .I could just drive it more!bajaherbie wrote: ↑Tue Nov 14, 2017 4:08 pm Have your wife pump the brakes every day. I am sure she will go for that!
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- dustymojave
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Re: Brakes going soft
NOW you're talking!
Richard
Lake LA, Mojave Desert, SoCal
Speed Kills! but then...So does OLD AGE!!
Tech Inspection: SCCA / SCORE / HDRA / ARVRA / A.R.T.S. OffRoad Race Tech - MDR, MORE, Glen Helen BajaCup
Retired Fabricator
'58 Baja with 955K Miles and counting
Lake LA, Mojave Desert, SoCal
Speed Kills! but then...So does OLD AGE!!
Tech Inspection: SCCA / SCORE / HDRA / ARVRA / A.R.T.S. OffRoad Race Tech - MDR, MORE, Glen Helen BajaCup
Retired Fabricator
'58 Baja with 955K Miles and counting