1995 Plymouth Voyager 6 cyl Front Wheel Drive Automatic 150k miles
basically I have had a SOFT pedal appear, disappear & reappear for over 9 mos. W/ NO visible discernible fluid loss
1 trip/1 day/1 week it's ALL firm & fine - the next trip /next day/ next week it's soft & the brake light comes on accompanied by a springy sounding click under the dash (which I assume is the pressure differential switch tripping?).
I have had 3 shops/mechanics assess it & heard 3 different opinions;
*shop#1 -says NO leaks -MC GOOD -booster BAD. Problem w/ that is I have vacuum pressure & NO hard pedal, also checked for fluid in booster & found NONE. Anyway -can a booster go out one day & not the next? So that doesn't seem to fit.
I have talked w/ several independent mechanics & spent considerable time online in forums & researching the problem. As in my previous post the consensus seemed to be MC so I replaced w/ a rebuilt one & all was FIRM & fine for about a week & then the next morning it's gone again.
**shop#2 bleeds complete system (but not sure
ABS mod was opened). They say left rear wheel cylinder is leaking & should be replaced. Aha! This makes sense & is my answer.
hire independent (flaky CL) mechanic to replace it & he adamantly says NO leaky wheel cylinder. I contest & question that & he says shop#2 trying to 'rip me off' (& why he no longer works for shops). He says rebuilt MC bad & should be replaced w/ new one - so I do.
brakes are FIRM & fine for another week & then gone again one morning. I bleed that circuit (suspected wh cylinder) & still seems to be air in the line. Once again all is FIRM & fine for a few days & then SOFT & brake light.
when it goes out, I can pump pedal a few times & light goes off & can get pressure back. Sometimes it stays awhile, sometimes it's gone by the next brake stroke.
more data (& questions);
---temperature & atmospheric weather changes seem to trigger the change. Can parts be expanding contracting w/ minimal seepage yet enuff to lower the hydraulic pressure?
--- my drive is a steep incline & I park w/ rear higher than front. Could trapped air be working thro the lines at these changes in angle?
I've sunk quite a bit of time & money into this @!#$% Problem already w/ NO resolution in site. I'm completely baffled & frustrated (& depressed) with it. I really don't know where to look next.
anyone HELP please? Would appreciate any theories -covered or not
have the same problem?
Thursday, September 16th, 2010 AT 1:35 PM