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Old 06-20-2019, 06:34 PM   #1
crap GC 99
Scooby Newbie
Member#: 413457
Join Date: Feb 2015
Location: Oklahoma
Exclamation New calipers and MC.. now no brakes

I have a 1999 Impreza L.. which had original calipers and master on it with 230k miles. Brakes had been real weak for a long time but I just drove around it. Finally got a little change in my pocket, and decided to replace the FR caliper that had a minor leak and a rough looking piston.

well, the brakes improved dramatically! But, I could tell the master was weak because they would fade/fall with the master cyl test (car off, pump and hold, etc). happy about the improvement with one caliper replaced (Autozone caliper) .. I decided to do the master cyl and other caliper also. Since then, very very soft and low pedal. probably 20% normal braking power. I tried my best to bleed and rebleed. and finally took it in to a pro mechanic. The rear drum pistons and pads were replaced by a pro hoping for improvement, but.. he couldn't get the brakes to perform any better (at all). He was stumped and just gave up after a few days of bleeding and getting nowhere. Zero leaks anywhere.

I did notice the banjo bolts on the Autozone calipers have smaller heads. IDK if the bore is smaller or not.. but smaller seems like it would yield more pressure not less. (but might make bleeding harder)

and.. no. I didnt' bench bleed the master. I thought I could do that on the car (I don't hve a bench/vice).. but there's no way to move the lines off the master to bleed in the car. they can be loosened, but not backed off etc.
also, I had to take the FR line off and attach it to the MC before installing the MC because it just would not catch the threads in the car. i topped off the MC in the car and gravity bled it to start. i put a board behind the pedal when i used the buddy method.

I keep looking at the master which is tilted up a few degrees.. and thinking air is trapped in the front of the master. it's a 4 port master btw. Two on side and two on bottom. the Front top has an 'S' mark above it. does that stand for 'Service' as in .. bleed here? I've considered parking the car on a decline to move the alleged bubble to the rear.

any ideas? my bleeding tricks and the mechanics have so far failed to fix my dry MC install fubarsky.

Looking forward to any assist. Thanks in advance.
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