'76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
3 posters
G3GM :: G3 Tech :: Brake Upgrades
Page 1 of 1
'76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
I had the correct Delco Morraine # 5470409 master cylinder rebuilt for my car at White Post restorations in VA after having nothing but trouble with the new (overseas) and reman units. I sent the master back to them because the the lid leaked....and they machined the surface of the casting. The lid, bail handle, and gasket I have were purchased new as a set on eBay...includes the Dorman gasket that appears to be the only one available for this application. I have tried bending the handle to clamp down harder on the lid, as well as replacing the handle with a decent used GM one off a '72 Monte Carlo. I pulled a bit of fluid out of the rear chamber in case the level was too high and saturating the rear of the gasket.
NONE OF THIS HAS SOLVED THE PROBLEM. I'll put a few miles on the car and see a small stream of fluid out the back of the lid.
I can get an NOS # 18000779 lid on eBay, but the # 5470404 GM gasket is nowhere to be found.
HAS ANYBODY DEALT WITH THIS ISSUE BEFORE? Pics attached....thanks in advance.
NONE OF THIS HAS SOLVED THE PROBLEM. I'll put a few miles on the car and see a small stream of fluid out the back of the lid.
I can get an NOS # 18000779 lid on eBay, but the # 5470404 GM gasket is nowhere to be found.
HAS ANYBODY DEALT WITH THIS ISSUE BEFORE? Pics attached....thanks in advance.
relic7680- G3GM Member
- Street Cred : 1
Re: '76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
Well it has to be the lid assembly as it is not leaking from the master cylinder body. Where did you get the lid assembly? I have never had this problem myself so can't say what I did to fix. But I did buy a new complete cylinder assembly, rather than a cylinder one place and a lid another.
The only thing I can suggest is that you get the NOS lid and get another Dorman gasket and hope it is a lid misfit that is the problem.
The only thing I can suggest is that you get the NOS lid and get another Dorman gasket and hope it is a lid misfit that is the problem.
76Chevelle2Tone- G3GM Member
- Street Cred : 0
Re: '76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
The aftermarket lid/handle/gasket assembly was purchased as a set on eBay, and is the only readily available setup. The handle in my pics here is a used OE piece off a '72 Monte Carlo.
I just purchased an NOS GM lid (no gasket or handle) off eBay yesterday that I will try soon.
The parts store masters I tried before (all leaked from the piston seal or would not bench bleed properly) had new lids and gaskets....probably should have swapped them with some of my old stuff to try...oh well.
One guy said that unless you have to pry the handle off the lid with a screwdriver that it's not tight enough....so I may revisit that with my aftermarket handle alterations.
I just purchased an NOS GM lid (no gasket or handle) off eBay yesterday that I will try soon.
The parts store masters I tried before (all leaked from the piston seal or would not bench bleed properly) had new lids and gaskets....probably should have swapped them with some of my old stuff to try...oh well.
One guy said that unless you have to pry the handle off the lid with a screwdriver that it's not tight enough....so I may revisit that with my aftermarket handle alterations.
relic7680- G3GM Member
- Street Cred : 1
76Chevelle2Tone likes this post
Re: '76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
Many of the replacement GM master cylinders I have installed leaked from around the lid. Inspection of the lid, bail, and rubber showed nothing visibly wrong. In most cases, I found this leaking will stop after time, as the rubber seems to stick to the top of the reservoir.
S3TPI- G3GM Member
- Street Cred : 0
Re: '76 GMC Sprint LEAKING MASTER CYLINDER LID GASKET
What I ended up doing was sourcing an NOS GM lid gasket, and that solved the problem. It was hard to come by and I had to pay up....but that's what it takes these days.
relic7680- G3GM Member
- Street Cred : 1
G3GM :: G3 Tech :: Brake Upgrades
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
|
|
Yesterday at 8:12 pm by 76Chevelle2Tone
» Rusty's progress motor Parts arrived LOL Half are on
Yesterday at 2:56 pm by Limey SE
» Painting Interior Plastic
Thu Apr 25, 2024 11:52 am by Joe73
» Anyone good at photoshop?
Wed Apr 24, 2024 9:37 pm by 76 Malibu
» El Camino/Sprint LH Aftermarket Quarter Panel FOR SALE
Wed Apr 24, 2024 5:18 am by relic7680
» 1973 chevelle four speed console
Sun Apr 21, 2024 10:32 pm by Limey SE
» dashes
Sun Apr 21, 2024 10:26 pm by Limey SE
» Used OEM Hood 73-77
Fri Apr 19, 2024 2:46 pm by 73 ss wgn
» 76 Laguna parked in 2002
Sun Apr 07, 2024 1:32 pm by Limey SE
» Thanks for having me
Wed Mar 27, 2024 7:25 pm by 77camino