motor oil in brake booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Drobny · 09-15-2005, 06:51 PM

Well I finaly found a truck thats worth working on, when I popped the lid off the brake booster it was full of oil. Could this hurt any of my brake parts? NO WONDER MY BRAKES DIDN'T WORK.

Pat

tomatocity · 09-15-2005, 07:08 PM

I am going to take a WILD GUESS and say someone connected the vacuum brake hose into the valve cover. It should be connected to a vacuum source like the rear of the intake manifold or the bottom of the carburetor. Just an uneducated wild guess.

cdowns · 09-15-2005, 07:09 PM

brake fluid probabally//new master and booster

**pjmoreland** · 09-15-2005, 08:23 PM

Is the oil in your master cylinder reservoir, or is it inside the vacuum booster itself?

67ChevyC10Stepside · 09-15-2005, 10:47 PM

brake fluid is polyglycol based petroleum will make all the seals in the system swell....new master cylinder calipers wheel cylinders anything with rubber seals....and you will need to completely flush the lines with brake clean and compressed air....

tomatocity · 09-16-2005, 02:18 PM

bump...and the answer is...

**VetteVet** · 09-16-2005, 03:27 PM

Quote:

Originally Posted by Drobny

Well I finaly found a truck thats worth working on, when I popped the lid off the brake booster it was full of oil. Could this hurt any of my brake parts? NO WONDER MY BRAKES DIDN'T WORK.

Pat

You said when you popped the lid off your brake booster- Did you mean the master cylinder cause the booster don't have a lid that I know of. I'd purge the MC and the rest of the system and replace with brake fluid and bleed the system and see if you have brakes. If you have ruined any seals then you may have to replace the parts as Cdowns stated. Are you positive it's engine oil because brake fluid gets dark in the MC when it gets old but it still smells like brake fluid. You may just have a bad MC.

Drobny · 07-08-2006, 02:26 PM

stupid me the oil was in the master cylinder reservoir :rolleyes
pat

70GMCer · 07-08-2006, 02:45 PM

I have the same problem, but it is the rear seal in the back of the master cyl that is leaking. Some fluid looks like it went into the vacuum booster. We'll see what happens after I change the MC.

09-15-2005, 06:51 PM	#1
Drobny Hunting is Life Join Date: Jun 2005 Location: Buffalo,MN Posts: 115	motor oil in brake booster Well I finaly found a truck thats worth working on, when I popped the lid off the brake booster it was full of oil. Could this hurt any of my brake parts? NO WONDER MY BRAKES DIDN'T WORK. Pat

09-15-2005, 07:08 PM	#2
tomatocity Registered User Join Date: Jun 2005 Location: Sacramento CA Posts: 1,255	I am going to take a WILD GUESS and say someone connected the vacuum brake hose into the valve cover. It should be connected to a vacuum source like the rear of the intake manifold or the bottom of the carburetor. Just an uneducated wild guess. __________________ Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck.

09-15-2005, 07:09 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	brake fluid probabally//new master and booster __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-15-2005, 10:47 PM	#5
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	brake fluid is polyglycol based petroleum will make all the seals in the system swell....new master cylinder calipers wheel cylinders anything with rubber seals....and you will need to completely flush the lines with brake clean and compressed air.... __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

09-16-2005, 02:18 PM	#6
tomatocity Registered User Join Date: Jun 2005 Location: Sacramento CA Posts: 1,255	bump...and the answer is... __________________ Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck.

09-15-2005, 08:23 PM	#4
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,240	Is the oil in your master cylinder reservoir, or is it inside the vacuum booster itself?

07-08-2006, 02:26 PM	#8
Drobny Hunting is Life Join Date: Jun 2005 Location: Buffalo,MN Posts: 115	Re: motor oil in brake booster stupid me the oil was in the master cylinder reservoir :rolleyes pat

07-08-2006, 02:45 PM	#9
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: motor oil in brake booster I have the same problem, but it is the rear seal in the back of the master cyl that is leaking. Some fluid looks like it went into the vacuum booster. We'll see what happens after I change the MC. __________________ 1997 GMC Sierra Ext 1965 Mustang



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