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  Topic Review (Newest First)
05-24-2019 02:35 PM
GTA R
Quote:
Originally Posted by mini1071 View Post
Worn valve guides could let a lot of oil flow into the cylinders when g’s from a hard turn piles the oil up to one side of the cam tray. My 88 Spider sucks it down the exhaust valves on hard right hand turn. Believe the exhaust side has no valve stem seals.
No, has to be brake fluid related if not head gasket.
Valve stem oil seals / valve guides = oil = blue smoke, not white.
05-24-2019 06:27 AM
howieb4 Mini, thanks for the additional info. But my issue is definitely related to the brake system. Going to spend my holiday weekend investigating.
05-23-2019 07:15 PM
mini1071 Worn valve guides could let a lot of oil flow into the cylinders when gs from a hard turn piles the oil up to one side of the cam tray. My 88 Spider sucks it down the exhaust valves on hard right hand turn. Believe the exhaust side has no valve stem seals.
05-17-2019 12:44 PM
Alfajay
Quote:
Originally Posted by howieb4 View Post
Is an MC repairable? Or it's just not worth the hassles and just go for a new one for $75 from Centerline.
Yea, you answered you own question. Sure, you can rebuild a MC. But the kit costs a few bucks and rebuilds aren't always successful. So if you can get a new one for $75, it's probably the better deal. Especially when you factor in your time to R&R the MC and bleed the brakes.

Quote:
Originally Posted by alfaparticle
Don't count on current aftermarket cylinders lasting that long.
Right! So if you got 15 years out of the last one, you're doing well.
05-17-2019 12:24 PM
PSk Lots of water is all that is required to save paint from brake fluid. What you do after the water is a personal choice and irrelevant ... 🙂
Pete
05-17-2019 11:09 AM
AlfistiSA Remembering all the time that brake fluid eats paint.... so whatever you do booster / MC & brake fluid-wise, mop up, clean up, rinse well & dry with clean paper towels.....

Been there, done that, rebuilt the boosters several times

Ciao
Greig
05-17-2019 09:03 AM
alfaparticle Don't count on current aftermarket cylinders lasting that long.
05-17-2019 08:57 AM
howieb4 Thanks Jay. I didn't want to mention that I am still driving the car, knowing from what has been posted that the diaphragm is slowly being eaten away. Kids being home from college, leaves me no other car to drive.

The braking system on my car was completely replaced by the previous owner around 15 years ago. So I am guessing that the in the lifespan of an MC, that mine is relatively young. Or maybe not. Is an MC repairable? Or it's just not worth the hassles and just go for a new one for $75 from Centerline.
05-17-2019 07:50 AM
Alfajay
Quote:
Originally Posted by howieb4 View Post
Weird thing is, almost all you mention is brake pedal feel. I feel no change in the effort to push the pedal. Car stops as it always has. Hopefully it's just a bad MC and not the whole booster.
No, that makes sense. The booster hasn't been harmed (yet) by the presence of brake fluid. And the MC is working OK - it's just leaking fluid from its rear seal.

You could run this way forever as long as you added brake fluid periodically - sort of like dealing with an engine that burns/leaks oil but otherwise has good oil pressure and compression.

The issue is that eventually the brake fluid will damage the booster diaphragm. At that point, your brake pedal will become harder. And of course, you look silly with all that white smoke on every hard turn!
05-17-2019 06:00 AM
howieb4 Hi all. Weekend plans to dig into the MC and Booster. Weird thing is, almost all you mention is brake pedal feel. I feel no change in the effort to push the pedal. Car stops as it always has. Hopefully it's just a bad MC and not the whole booster.
05-16-2019 03:42 PM
Gubi Yeah, if you take off the MC and just kinda swab the booster out with some soap and water it'll probably be okay. The fluid isn't great for the rubber diaphragm but it's not like it's an instant death sorta thing.
05-16-2019 03:33 PM
alfaparticle I had brake fluid in the booster many years ago. I mopped it up with paper towels and it has been fine since then. No removal, disassembly, etc.
05-16-2019 02:09 PM
davbert
Quote:
Originally Posted by Gubi View Post
That's not how the check valve works. The check valve allows flow from the booster to the engine. If there's fluid leaking into the booster it'll get into the engine even with a perfectly functional check valve.

The check valve is there so if the engine shuts off or you've got low engine vacuum you still have vacuum stored in the booster to enable power brakes.
you maybe correct come to think of it... i forgotten, its been many years since i removed my boosters and welded that check valve shut! thanks
05-16-2019 01:57 PM
Gubi
Quote:
Originally Posted by davbert View Post
leaky booster/mc or not... i reckon the reason brake fluid is coming out of the tail pipe as white smoke is the check valve from the intake port to booster has failed allowing fluid into the motor.

the check valve is the silvery thing that on the intake manifold runner closes firewall with hose attached to it. disconnected it, plug the hole and drive it to test it to see if it still smokes. be extra CAREFUL since your pedal effort has doubled or tripled without the vacuum assist.
That's not how the check valve works. The check valve allows flow from the booster to the engine. If there's fluid leaking into the booster it'll get into the engine even with a perfectly functional check valve.

The check valve is there so if the engine shuts off or you've got low engine vacuum you still have vacuum stored in the booster to enable power brakes.
05-16-2019 01:36 PM
davbert leaky booster/mc or not... i reckon the reason brake fluid is coming out of the tail pipe as white smoke is the check valve from the intake port to booster has failed allowing fluid into the motor.

the check valve is the silvery thing that on the intake manifold runner closes firewall with hose attached to it. disconnected it, plug the hole and drive it to test it to see if it still smokes. be extra CAREFUL since your pedal effort has doubled or tripled without the vacuum assist.
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