OT: Master Cylinder?
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Pro
Joined: Apr 2004
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From: Atascadero Ca
OT: Master Cylinder?
Ok. I mark this as ot kuz its for a Chrysler, New Yorker 1989, laundau, no ABS. Three days ago i noticed the brake pedal being slightly spongy. As in i had to press the pedal further down for normal brake action. Yesterday i drove it and it was a little worse. Today i drove it and its almost to the floor. I tried to bleed the brakes. With no success, specially with the front right. I have a mityvac, speed bleeders, and tried for several hours with no results. The paint on the brake booster is flaking as if brake fluid has hit it, however I can't really tell many other signs of leakage. About 2 weeks ago the resioivar was low so i filled it up. The rear wheel cylinders both look good, the front pads are new, the rear shoes look great. The front calipers are not leaking at all. Proportioning valve looks good, no leaks. So you guys think its the master cylinder?
Thanks, Mike
Thanks, Mike
Last edited by i885744; Jan 26, 2005 at 11:33 PM.
Thread Starter
Pro
Joined: Apr 2004
Posts: 687
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From: Atascadero Ca
Oh, also i did a little test. The only brake that is working is the front left. I have no idea how the proportioning works in this thing. The front left i can lock up on pavement. The front right can't hold back the tranny creep. I have no real way to test the rear's. The ebrake works fine, when i stomp on the brakes the car doesn't dart left so maybee the right rear is working to counter my front left.
Burning Brakes
Joined: Dec 2004
Posts: 1,234
Likes: 2
From: New Jersey
The rear main seal is leaking. I've seen it dozens of times. Best just to replace the whole thing than getting it rebuilt.
Could be just the seal or it could be the housing.
BTW- The MC is a diagonal on your car, I'm pretty sure, so one circuit feeds one front and the opposite rear. There are obviously 2 circuits (chambers).
Could be just the seal or it could be the housing.
BTW- The MC is a diagonal on your car, I'm pretty sure, so one circuit feeds one front and the opposite rear. There are obviously 2 circuits (chambers).
Burning Brakes
Joined: Dec 2004
Posts: 1,234
Likes: 2
From: New Jersey
YOU NEED TO WORRY ABOUT THE BOOSTER ALSO. If brake fluid has entered the booster it will deteriorate the inner seals!
Check your booster's internals through the hole in front. Use a rolled up paper towel to poke around to see if any fluids collected at the bottom.
This is very important!
Check your booster's internals through the hole in front. Use a rolled up paper towel to poke around to see if any fluids collected at the bottom.
This is very important!
Thread Starter
Pro
Joined: Apr 2004
Posts: 687
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From: Atascadero Ca
oh, good call on checking the booster, I wouldn't have thought of that. The booster is functioning great, holding vacuum after engine shutoff just like it should, but with the way the paint is flaking there's no doubt there is fluid in it.
I ended up driving the vette to school, but i found a spot where i could park paralell. Let's just hope it doesn't rain today (no wipers).
I ended up driving the vette to school, but i found a spot where i could park paralell. Let's just hope it doesn't rain today (no wipers).
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Race Director
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From: Scottsdale Arizona
Originally Posted by Mighty-Mouse
Thread Starter
Pro
Joined: Apr 2004
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From: Atascadero Ca
maybee i should make another bubba smily, holding a mityvac in 1 hand, and a brake brake booster in the other.
I bit the bullet and i must say that it takes about 4 hours on your back to change the booster on the vette. They chrysler took me 15 minutes. Putting the master cylinder in took 10. Bleeding the master took 5, and bleeding the brakes took 10 (speed bleeders). I must say that out of the cars in our family fleet, the brake feel on the chrysler is now second only to the corvette.
I bit the bullet and i must say that it takes about 4 hours on your back to change the booster on the vette. They chrysler took me 15 minutes. Putting the master cylinder in took 10. Bleeding the master took 5, and bleeding the brakes took 10 (speed bleeders). I must say that out of the cars in our family fleet, the brake feel on the chrysler is now second only to the corvette.