brake reservoir leaking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 07-09-2016, 09:40 AM

My brake reservoir leaks at the cap gasket on my 83. I have the JB7 brake system. I did replace the MC last year and now it still leaks at the gasket. What could be putting the reservoir under so much pressure? MC bad or maybe wrong MC? not really sure how to check. Any help is appreciated.

**Gregski** · 07-09-2016, 11:03 AM

fluid too high?

not sure exactly, but sometimes even new parts are bad, I went through 3 power steering pumps before settling on one I liked (ie that didn't leak)

**JIMs70GMC** · 07-09-2016, 02:42 PM

I replaced the top gasket, I will keep an eye on it. Fluid is 1/4" from the top maybe lower. When i checked yesterday it was about 1" below.

gwcrim · 07-11-2016, 06:38 PM

I had the same problem. I took the latch spring holder thingy off and bent is so it is tighter. That was over the weekend. Haven't checked it yet to see if it's fixed.

**JIMs70GMC** · 07-14-2016, 01:54 PM

Quote:

Originally Posted by gwcrim

I had the same problem. I took the latch spring holder thingy off and bent is so it is tighter. That was over the weekend. Haven't checked it yet to see if it's fixed.

I might do that, I remember needing a screw drive to pry them off, this one I can do easily with my hand.

07-09-2016, 09:40 AM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	brake reservoir leaking My brake reservoir leaks at the cap gasket on my 83. I have the JB7 brake system. I did replace the MC last year and now it still leaks at the gasket. What could be putting the reservoir under so much pressure? MC bad or maybe wrong MC? not really sure how to check. Any help is appreciated. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-09-2016, 11:03 AM	#2
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,811	Re: brake reservoir leaking fluid too high? not sure exactly, but sometimes even new parts are bad, I went through 3 power steering pumps before settling on one I liked (ie that didn't leak)

07-09-2016, 02:42 PM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: brake reservoir leaking I replaced the top gasket, I will keep an eye on it. Fluid is 1/4" from the top maybe lower. When i checked yesterday it was about 1" below. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-11-2016, 06:38 PM	#4
gwcrim Registered User Join Date: Jul 2016 Location: Steubenville Posts: 21	Re: brake reservoir leaking I had the same problem. I took the latch spring holder thingy off and bent is so it is tighter. That was over the weekend. Haven't checked it yet to see if it's fixed.



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