pressure bleeding

[just-n-time]

ok I went to NAPA and picked up a tire valve core, the type that has a rubber gromit and a nut to tighten or clamp it in place. I drilled a hole in the cap of the master cylinder and installed the valve core. I put pressure in it from my compressor but it leaks around the threds of the cap so I can not keep a steady pressure. yes the rubber o ring is in the cap. what the hell is next?

[RANDY P]

how much pressure are you using?

IIRC when I use the motive to pressurize it works wonderful under 15 PSI.

[just-n-time]

Originally Posted by RANDY P

how much pressure are you using?

IIRC when I use the motive to pressurize it works wonderful under 15 PSI.

I had my regulator dialed down to 30 psi

[Duner]

I have not done a car like yours but I would go down to 5-8 lbs. I don't think I ever use 10 lbs even.

[Mike D]

Originally Posted by Duner

I have not done a car like yours but I would go down to 5-8 lbs. I don't think I ever use 10 lbs even.

+1 on that. The 30lbs is way too high. I foresee complications with the compensating valve at that pressure. Also a possible conflict with any anti-lock braking system if you have one.

[just-n-time]

Originally Posted by Mike D

+1 on that. The 30lbs is way too high. I foresee complications with the compensating valve at that pressure. Also a possible conflict with any anti-lock braking system if you have one.

Boy this is some sort of conflict, some of the post I have read say 30 psi and now the return comments are mutch less than I have read. I just orderd a Motive bleeder I hope this will fix the system! I am curios though, I built a pressure cap from the original master cylinder cap, and it leaks, is the one Motive has of thicker plastic?

[ILUVMILS]

Originally Posted by Mike D

....The 30lbs is way too high. I foresee complications with the compensating valve at that pressure....

Agreed. At 30 PSI I foresee complications washing brake fluid from hair, eyes, garage wall, etc.

[alabbasi]

I was able to bleed my master cylinder by using a motive pressure bleeder and then cracking open all the lines one by one.

It worked like a champ.

[RANDY P]

Heck, you are under there already just try doing it the old fashioned way....
Put a wooden block under the brake pedal to limit the stroke so you don't damage the MC internal seals.

rjp

[just-n-time]

Originally Posted by RANDY P

Heck, you are under there already just try doing it the old fashioned way....
Put a wooden block under the brake pedal to limit the stroke so you don't damage the MC internal seals.

rjp

Takes two to tango, I work by myself thats why I make as many tools as I do from liner pullers and press tools on class eight v hick ells to autos and cycles. its hard to find people to work with and if you do they want more than you make.

[lizem100]

The electric pressure bleeders at the dealership run at 15 psi. I have used them many times

[just-n-time]

Originally Posted by lizem100

The electric pressure bleeders at the dealership run at 15 psi. I have used them many times

well I have had trouble with air leaking around the threads of the cap I have a piece of taype on it to seal it off, at 10 lbs it holds but I stood there holding the air chuck on the valve core with nothing coming out from the caliper. so I am frustrated with my home made system.

[just-n-time]

THE NEW MOTIVE PUMP CAME IN THIS EVE. BUT AFTER HOOKING UP AND PUMPING THE PRESSUR TO 10 NOTHING HAPPEND THEN 15 STILL NO FLUSH NOW TO 20 STILL NO FLOW! WHAT THE HELL CAN BE STOPPING THE FLUID FROM GOING THREW THE LINES?

[cbc atl]

Did you try all 4 bleeder screws. I have heard of trash stuck in caliper maybe from brake line or fittings breaking down.

[tomas_maly]

I had an issue with the master cylinder where the little black rubber caps (for brake level sensor?) were cracked and the master cylinder would not build any pressure. Air (and brake fluid) would just leak. What I did was apply a TON of gorilla glue to the cracked cap and then put a hose clamp (3/4 inch?) around and tighten it as much as possible. I haven't bled the brakes yet but the pressure was holding with minimal air leaking (still heard a hissing sound, just was tolerable).