Please help!... I never thought to say this but I am about to quit... I can't solve my problems with brakes and taking the jeep outside the city with this conditions make me evaluate other alternatives (TJ)...
So here is the background... I upgraded to vacuum booster brakes but I can't get enough braking power to block the tires or do emergency braking...
I changed my proportioning valve, I have the 8" diameter booster, brand new master cylinder from Chevy Astro, new brake lines, new valve check on the booster, hose for vacuum is new and is not collapsing... new pads...
Man, everything is new now and I still have problems...
I tested the booster to see is that was the problem but no, no leaks at all.
Braking power (assisted) came occasionally and I do not know under what conditions, with it I can block and make an emergency stop really easy but then suddenly I have no assistance...
So... pressing the pedal at half brakes good, but when I floor it it behaves like mechanical...
Any suggestion?... What could it be?
Diego Robles / XE1XZQ
Last edited by DGRobles; 01-30-2014 at 05:37 PM..
Reason: Title wrong...
Are you using stock brakes (disc/drum)? Curious why you went with that MC? Not being familiar with the specs... what are the piston cylinder dimensions (volume)? Also, what proportioning valve did you use to replace the stock unit?
Had a similar problem when I swapped in a new master cylinder and booster - found that the problem to be inadequate bleeding of the master cylinder. Had to work hard at getting all the air out of the MC bore but once done, and bled the entire sytem again, the brakes worked great.
Is this the more recommendable procedure?... pressure bleed?
At this stage, I feel it's your best option.
Just make sure you have a hose coming off the bleed-nipple into a bottle with some brake fluid already in it.
Do one wheel at a time, and do the whole procedure twice.
Best of luck and post up results.
Have'n you along, is like loose'n 2 good men