simple question maybe ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greedy geezer · 12-13-2015, 01:49 PM

I was up on the Highway last night and a couple cars in front had a collision and I had to get on the breaks hard ,I don't tail gate so no problem But today, I popped the hood and notice some dampness on the Brake fluid reservoir so I think the high pressure leaked out a little, Brakes feel good truck is stopping Fine, I was just going to refill the res ,But am wondering if this will be problem later on ? also what kind of Break fluid should I add, 1972 C20 if that is the best thing for Now
thanks
gg

scotts72heavyhalf · 12-13-2015, 02:01 PM

Thanks pretty common, remove the cover and check the rubber gasket, if it has rust on it clean it off well and wipe down the surfaces with some light oil, break fulid is highly corrosive on any surface, dont over fill the reserve and use DOT 3 non-synthetic break fluid.

davepl · 12-13-2015, 02:07 PM

I wonder how safe those old hydraulic trailer brake setups were? I assume that's the T tap coming off... hope it goes somewhere solid!

I'd still have someome strong heave on the brakes while you're watching underhood with any existing fluid dried and cleaned. If it's slosh from the reservoir, no problem, but if its a high pressure fitting leak, you'd want that checked.

If you can get it totally clean and dry you can check yourself, I'd imagine.

greedy geezer · 12-13-2015, 02:55 PM

Yes Thanks Guys that is good advise I'm pretty sure its reservoir But will check lines and connections, brakes still feel good I'll do this tomorrow on my day off , at least I stayed out of the ditch the other two were screwed nobody hurt though
gg

EARNHARDT#3 · 12-13-2015, 03:37 PM

When you nail the brakes (not BREAKS ;-) ) there's basically a fountain of fluid in the reservoir. So if the gasket isn't sealing properly you'll see a little fluid.

greedy geezer · 12-13-2015, 04:23 PM

Quote:

Originally Posted by EARNHARDT#3

When you nail the brakes (not BREAKS ;-) ) there's basically a fountain of fluid in the reservoir. So if the gasket isn't sealing properly you'll see a little fluid.

Ha Yeah I ain't the best "typer" or speller and spell check doesn't keep things in context
gg

Gimme Jimmy · 12-13-2015, 10:35 PM

Adjust your rear brakes. The auto adjusters dont work very well from my experience. You cant stop if your brakes dont work on all four. The rubber gasket under the lid is probably leaking.I would be more concerned if you have a pressure leak.

Alex V. · 12-14-2015, 01:37 AM

Brake fluid itself isn't corrosive - it attracts water, and doesn't get flushed at regular intervals, therefore promoting corrosion from water. But on my vehicles, seepage like that isn't something I worry about. The edge of the MC will surface rust under the rubber seal leading to this - wipe all the rust scale off both surfaces and it'll probably go away for a while.

rattle69 · 12-14-2015, 01:50 AM

Quote:

Originally Posted by Alex V.

Brake fluid itself isn't corrosive - it attracts water, and doesn't get flushed at regular intervals, therefore promoting corrosion from water. But on my vehicles, seepage like that isn't something I worry about. The edge of the MC will surface rust under the rubber seal leading to this - wipe all the rust scale off both surfaces and it'll probably go away for a while.

maybe not corrosive but will kill your paint. Dot 3 and dot 4 brake fluid is hygroscopic and does take in water like you said. This being said its not the water that will make paint bubble and strip off when the fluid gets spilled or leaks on the paint.

**special-K** · 12-14-2015, 09:02 AM

This means you have very good brakes.

On the trailer brake lines, they are like any other part of the system. As long as everything is tight they are safe. I'm in the habit of removing them because they usually aren't working right and just add more unions to leak, as well as the component itself. The modern brake systems are so much nicer to use... but don't look as cool as the old ones

greedy geezer · 12-14-2015, 09:21 AM

Quote:

Originally Posted by special-K

This means you have very good brakes.

On the trailer brake lines, they are like any other part of the system. As long as everything is tight they are safe. I'm in the habit of removing them because they usually aren't working right and just add more unions to leak, as well as the component itself. The modern brake systems are so much nicer to use... but don't look as cool as the old ones

I don't know much about system yet, only had the truck a few months, but I do have a Camper out back I use for my Head quarters in the summer, one way I was able to get my Wife on board to buy the truck was planning to take her out out next summer in the camper I will be learning more about this all in the spring

greedy geezer · 12-14-2015, 10:37 AM

Okay Guys I opened the Reservoir Cleaned up the sealing edges and rubber, only added a very little dot 3 level was about 1/4 inch from rim put it back together, brakes feel good and hard no slip and did not see any more seep I'll keep an Eye On it
Thanks for the advice
Merry Christmas
gg

12-13-2015, 01:49 PM	#1
greedy geezer Registered User Join Date: Oct 2015 Location: Stoughton MA where everyhing on the road gets rusted out from winter and rock salt Posts: 168	simple question maybe ? I was up on the Highway last night and a couple cars in front had a collision and I had to get on the breaks hard ,I don't tail gate so no problem But today, I popped the hood and notice some dampness on the Brake fluid reservoir so I think the high pressure leaked out a little, Brakes feel good truck is stopping Fine, I was just going to refill the res ,But am wondering if this will be problem later on ? also what kind of Break fluid should I add, 1972 C20 if that is the best thing for Now thanks gg Attached Images

12-13-2015, 02:01 PM	#2
scotts72heavyhalf Registered User Join Date: Aug 2007 Location: Sandy, Oregon Posts: 1,551	Re: simple question maybe ? Thanks pretty common, remove the cover and check the rubber gasket, if it has rust on it clean it off well and wipe down the surfaces with some light oil, break fulid is highly corrosive on any surface, dont over fill the reserve and use DOT 3 non-synthetic break fluid. __________________ Scotts72C10

12-13-2015, 02:55 PM	#4
greedy geezer Registered User Join Date: Oct 2015 Location: Stoughton MA where everyhing on the road gets rusted out from winter and rock salt Posts: 168	Re: simple question maybe ? Yes Thanks Guys that is good advise I'm pretty sure its reservoir But will check lines and connections, brakes still feel good I'll do this tomorrow on my day off , at least I stayed out of the ditch the other two were screwed nobody hurt though gg

12-13-2015, 03:37 PM	#5
EARNHARDT#3 Registered User Join Date: May 2014 Location: PA Posts: 1,417	Re: simple question maybe ? When you nail the brakes (not BREAKS ;-) ) there's basically a fountain of fluid in the reservoir. So if the gasket isn't sealing properly you'll see a little fluid. __________________ 1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP

12-13-2015, 10:35 PM	#7
Gimme Jimmy Registered User Join Date: Jan 2014 Location: Aloha, Or. Posts: 46	Re: simple question maybe ? Adjust your rear brakes. The auto adjusters dont work very well from my experience. You cant stop if your brakes dont work on all four. The rubber gasket under the lid is probably leaking.I would be more concerned if you have a pressure leak. Last edited by Gimme Jimmy; 12-13-2015 at 10:44 PM.

12-13-2015, 02:07 PM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: simple question maybe ? I wonder how safe those old hydraulic trailer brake setups were? I assume that's the T tap coming off... hope it goes somewhere solid! I'd still have someome strong heave on the brakes while you're watching underhood with any existing fluid dried and cleaned. If it's slosh from the reservoir, no problem, but if its a high pressure fitting leak, you'd want that checked. If you can get it totally clean and dry you can check yourself, I'd imagine. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

12-14-2015, 01:37 AM	#8
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: simple question maybe ? Brake fluid itself isn't corrosive - it attracts water, and doesn't get flushed at regular intervals, therefore promoting corrosion from water. But on my vehicles, seepage like that isn't something I worry about. The edge of the MC will surface rust under the rubber seal leading to this - wipe all the rust scale off both surfaces and it'll probably go away for a while. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

12-14-2015, 09:02 AM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: simple question maybe ? This means you have very good brakes. On the trailer brake lines, they are like any other part of the system. As long as everything is tight they are safe. I'm in the habit of removing them because they usually aren't working right and just add more unions to leak, as well as the component itself. The modern brake systems are so much nicer to use... but don't look as cool as the old ones __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-14-2015, 10:37 AM	#12
greedy geezer Registered User Join Date: Oct 2015 Location: Stoughton MA where everyhing on the road gets rusted out from winter and rock salt Posts: 168	Re: simple question maybe ? Okay Guys I opened the Reservoir Cleaned up the sealing edges and rubber, only added a very little dot 3 level was about 1/4 inch from rim put it back together, brakes feel good and hard no slip and did not see any more seep I'll keep an Eye On it Thanks for the advice Merry Christmas gg



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