I am having a little issue when re-bleeding my brakes. All i am doing is a fluid change. Car has been driven and stops. Nothing has been pulled apart on brakes in some years though.
I dont get full brake clamping pressure at my front calipers/rotors after the first bleed attempt to the next. EVEN the rear brakes when i began the bleeding process, from LHR > RHR, was a bit sus.
> Now at LHF,It takes about 3-4 pumps of the pedal to build more pressure in the front brake circuit before the calipers will lock onto the rotors again. And thats checking both sides for clamping force, only when bleeding at LHF.
Also fluid flow out of the LHF caliper bleed nipple/bleed hose can be minimal, after the first initial bleed attempt.(caliper nipples are at the top b4 u ask ).
My M/C was resleeved (about 9 years ago) and in the attached images, you can see the small orifices drilled into the sleeve, which are way smaller than the holes drilled into the reservoir base which i believe are factory size, so why should the sleeve drillings be way smaller?
Could that be the problem, not enough fluid getting through the small orifices??.
I have checked my pushrod protrusion from the booster face, which is now re-adjusted to 28mm (*was 30mm).
Maybe it could be shortend a bit more yet but in doing my maths on my setup (attached scrawl),that i work out my pushrod maybe now 1mm clear of bottoming into piston when all fitted up.
Where as before (*at 30mm) i thought maybe i was not getting full piston travel/effort because the pushrod had already partially pushed the piston in by 1mm, sounds F-all, but had to check.
I have not removed my pushrod from the booster, but can feel it sitting against the reaction disc, feels and sounds like the head of the pushrod is seating against something rubbery.
With the engine running and bleeding, still no different really to the above description. And that was with the booster pushrod at *30mm. Which was not self applying any brakes either.
So additionally... could i have an internal issue within my M/C like perished piston seals?
My gut feel is to bust the M/C into pieces and answer my own questions, but wanted to share the issue all the same.
Cheers
Jaso.