New brake booster/master cyl./prop. valve? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**COBALT** · 04-06-2004, 01:21 PM

I'm loosing brake fluid out of the front reservior of my master cyl. It's not leaking at the wheels, but there's paint lifting off the base of my brake booster, so I assume it's running out of the back of the master cyl. running down the brake booster (lifting the paint off) and getting burned up somehow before it dissapears under the truck (obviously only when I'm driving). I don't think there's anything I can do to fix this with the existing booster. My master cyl. is extremely rusted so I question how clean it is, and the prop valve doesn't look like it's in good shape.

Therefore I figured I might as well just take care of the entire problem all at once. I'd like a nice stock replacement since it's a work truck. Anyone have any suggestions where I could get a good new master cyl., brake booster, and prop. valve?

71Chev · 04-06-2004, 01:26 PM

NAPA, Autoworks, Car Quest, etc.... They should all stock them.
GMCPaul

gr8scott51 · 04-06-2004, 03:52 PM

...or buy the rebuild kit for your master cylinder. A cheap cylinder hone will clean up the cylinder and new seals should stop the leaks. Rust on the outside can be taken care of with a bead blast or wire brush, then apply some POR15.

Folks on e-bay make a living doing this. You already have the parts, unless they're cracked, they'll work.

Good luck, Scott

cableguy0 · 04-06-2004, 04:47 PM

rebuilding a master cylinder is pointless and way too much work when you can buy a rebuilt master cylinder for 15 bucks already done and nice and clean. hell the rust removal alone is worth 15 bucks

72 Blazerman · 04-06-2004, 06:16 PM

Go to NAPA, I just picked ordered one for my truck. I just got the booster and master cylinder for about 130.00.

Doug

**COBALT** · 04-06-2004, 06:56 PM

Hmm...that's pretty good. I'll look into it.

What about the prop. valve?

72 Blazerman · 04-06-2004, 07:47 PM

I did not get the valve, but I am sure they can get that too.

Doug

**PICKMUP** · 04-07-2004, 01:18 AM

I have been having the same problem on my Blazer for a few years. It has been driving me crazy. I thought I was smart and bought a premium quality rebuilt MS with lifetime warranty. Well, the auto parts replaces it at no cost, every year or so, but it keeps taking the paint off the booster. It always starts leaking out the rear seal on the MS, so I now have/sell brand new, lifetime warrantied MS. I hope they will solve the problem. I bought lots of them so I can sell them for $65 each.
I also have new booster/bracket/MS/prop valve/sets, but they are a little spendy with all of those new parts.

Longhorn Man · 04-07-2004, 01:22 AM

I don't think anyone makes the prop valve, they hardly ever go bad, no point in replacing it really.

04-06-2004, 01:21 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	New brake booster/master cyl./prop. valve? I'm loosing brake fluid out of the front reservior of my master cyl. It's not leaking at the wheels, but there's paint lifting off the base of my brake booster, so I assume it's running out of the back of the master cyl. running down the brake booster (lifting the paint off) and getting burned up somehow before it dissapears under the truck (obviously only when I'm driving). I don't think there's anything I can do to fix this with the existing booster. My master cyl. is extremely rusted so I question how clean it is, and the prop valve doesn't look like it's in good shape. Therefore I figured I might as well just take care of the entire problem all at once. I'd like a nice stock replacement since it's a work truck. Anyone have any suggestions where I could get a good new master cyl., brake booster, and prop. valve? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

04-06-2004, 01:26 PM	#2
71Chev Senior Member Join Date: Dec 2000 Location: Indiana Posts: 3,074	NAPA, Autoworks, Car Quest, etc.... They should all stock them. GMCPaul __________________ 71 Chevy CST Long Fleet 350/350/3.07 leaf rear.

04-06-2004, 03:52 PM	#3
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	...or buy the rebuild kit for your master cylinder. A cheap cylinder hone will clean up the cylinder and new seals should stop the leaks. Rust on the outside can be taken care of with a bead blast or wire brush, then apply some POR15. Folks on e-bay make a living doing this. You already have the parts, unless they're cracked, they'll work. Good luck, Scott __________________ Silence is golden, duct tape is silver. - Scott

04-06-2004, 04:47 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	rebuilding a master cylinder is pointless and way too much work when you can buy a rebuilt master cylinder for 15 bucks already done and nice and clean. hell the rust removal alone is worth 15 bucks __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

04-06-2004, 06:16 PM	#5
72 Blazerman Chevelle Nutt Join Date: Nov 2002 Location: Fredericksburg, Va. Posts: 204	Go to NAPA, I just picked ordered one for my truck. I just got the booster and master cylinder for about 130.00. Doug __________________ 71 CST Blazer 4X4, 350, on da tree 81 Blazer 2wd 350 350 99 F*** Ranger, I know, I know but it's cheap transportation 83 Mustang GT 5.0 4 speed loaded "got cubic inch?"

04-06-2004, 06:56 PM	#6
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Hmm...that's pretty good. I'll look into it. What about the prop. valve? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

04-06-2004, 07:47 PM	#7
72 Blazerman Chevelle Nutt Join Date: Nov 2002 Location: Fredericksburg, Va. Posts: 204	I did not get the valve, but I am sure they can get that too. Doug __________________ 71 CST Blazer 4X4, 350, on da tree 81 Blazer 2wd 350 350 99 F*** Ranger, I know, I know but it's cheap transportation 83 Mustang GT 5.0 4 speed loaded "got cubic inch?"

04-07-2004, 01:18 AM	#8
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,125	I have been having the same problem on my Blazer for a few years. It has been driving me crazy. I thought I was smart and bought a premium quality rebuilt MS with lifetime warranty. Well, the auto parts replaces it at no cost, every year or so, but it keeps taking the paint off the booster. It always starts leaking out the rear seal on the MS, so I now have/sell brand new, lifetime warrantied MS. I hope they will solve the problem. I bought lots of them so I can sell them for $65 each. I also have new booster/bracket/MS/prop valve/sets, but they are a little spendy with all of those new parts. __________________ Email: frankeham@comcast.net Phone: 360-956-7170

04-07-2004, 01:22 AM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I don't think anyone makes the prop valve, they hardly ever go bad, no point in replacing it really.



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