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Brake imbalance after Jumbo upgrade

volvero

volvero

Member
Joined
May 18, 2003
Location
Santiago de Chile
I'm having a weird problem with my brakes after the jumbo upgrade. It pulls to the left when braking. I didn't noticed it since the rear right wheel compensates this a bit. The thing is that I plugged the rearmost port at the MC and the outlet at the junction block according to your pictures. So the front right caliper is being fed directly from the MC and the front left from the JB. (each one from different sides of the JB) When I bleed the brakes, I have little pressure at the front right and rear left calipers, and the pedal doesn't go to the floor, but when I bleed the front left caliper the pedal goes right to the floor and there is a lot of pressure out of the bleeder. The front circuit of the MC is not pressurizing enough the circuit but there is no imbalance since the light doesn't goes on ?? I'm sure now I have a diagonal dual system...

Thanks for any advice..
 
wtf did you do? According to whos pictures?
Take it to a brake shop who understands these systems. Your life depends on it.
 
Read green manual here:
http://blarf.homeip.net/greenbook/TP30838_2/pdf

Later cars and ABS cars have front/rear axle split, the junction block incorporates a pressure reducer for the rear.

Your car should not have the reducer and should be running the triangular split system. With the jumbo conversion you should change to diagonal split (ie front-left/rear-right and front-right/rear-left) You shouldn't have to change it to front/rear spit to get the system balanced. If you can't get it balanced something is wrong somewhere and if everything worked before the jumbo conversion my guess is you just don't have it bled right.

James
 
Last edited:
arsenix said:
Read green manual here:
http://blarf.homeip.net/greenbook/TP30838_2/pdf

Later cars and ABS cars have front/rear axle split, the junction block incorporates a pressure reducer for the rear.

Your car should not have the reducer and should be running the triangular split system. With the jumbo conversion you should change to diagonal split (ie front-left/rear-right and front-right/rear-left) You shouldn't have to change it to front/rear spit to get the system balanced. If you can't get it balanced something is wrong somewhere and if everything worked before the jumbo conversion my guess is you just don't have it bled right.

James
Click to expand...

Thanks a lot for this very valuable information! Will bleed it again tomorrow.
 
I checked my old post from when I had a simular issue on one line, in the end I just kept flushing clean fluid though the line giving me poor flow, it came better after a lot more fluid had been pushed through.

My guess is I had just general crud in that line/hose, it's possible you got something in the lines when changing the calipers etc, so it may flush out with extended bleeding, maybe with some heat cycles inbetween.
 
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