spongy brake pedal

unwed_transient · Nov 9, 2005

background info:

i have a small leak between the booster and mc. every two thousand or so miles the brake light will come on, so i'll refill. i was going to have to keep doing this until i either just bought a new mc or upgraded to z32 stuff.

problem:

brake light came on a few days ago. i didn't have time to refill it until today.
when i started the car up this morning, the brake pedal was pretty spongy.
when i got home tonight i refilled the resevoir. brake pedal was still spongy. i checked the area around the booster/mc and saw no fresh leaks. after driving to work, i re-checked the resevoir and the fluid level had not changed. i was hoping it would go down a little, but alas, no.

diagnosis:

since the fluid level didn't drop, i'm sure i have no leaky lines, but i'll check them tomorrow anyway.
bad mc?...the mc seems a little loose on the booster...i'll try tightening that up
???..anything i'm forgeting?
anybody ever have this problem/mc crapping out?

this isn't the 1st time i've been low and refilled...so i don't know what's different about today... :12dunno

edit: checked lines on firewall and vacuum hose. All seem fine.

DeeDub429 · Nov 9, 2005

Sounds like you got a little air in the lines. That always causes a spongy feel in the pedal. Might as well just enjoy the sponginess until you can repair the whole system, wouldn't be much sense in bleeding the lines if you've already got a leaky system..

D1GP · Nov 9, 2005

u got air in the system since you been low for days...
bleed it, it's not that hard.

dopeassjackson · Nov 9, 2005

you will continue to have a spongy brake until you fix the leak and bleed the whole brake system. also some holes in brake lines wil let air in but no fluid out. when u bleed the system start with the furthest caliper from the MC, right rear, left rear, right front left front. if you have ABS this will change slightly.

unwed_transient · Nov 9, 2005

no abs, but i'll bleed the system.

this morning the pedal was noticeably stiffer, but not quite as stiff as it was.

thanks fellas.

unwed_transient · Nov 14, 2005

another edit:

rr caliper was leaking very badly. after i filled the resevoir, it was bone dry in two days. so i replaced the faulty caliper today. i have yet to bleed the brakes because i'm lazy.

spongy brake pedal

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