North American Turbocoupe Organization



Brake fluid leak I cant find
Chas K 88 Offline
Member
#1
This leak originates at the master cylinder area and spreads forward to drip from the sway-bar bushing and backward traveling inside the sub-frame to drip out the open end. It seems to have "wicked" all over that general area. I have been all over & under the car with an assistant pumping the brakes with key on & I cant find the source. I see fluid clinging from the electric pump & the switch next to it but I cant see any fluid coming from them, it looks more like gravity brought it there or it just magically appeared. I pulled the accumulator (after depressurizing the system)and the o-ring looked fine as well as the mating surface. The steel lines are all dry as well as the junction/distribution (??) block they come from. Also in 45 minutes of searching, there were no drips (I said it was a slow leak) The brakes work great but I have to add fluid every week or so and I want it fixed.
My research here says that, $$-wise, I'm better off replacing the setup with vacuum assist but I'd like to hear more from others who have done it. There is a nice writeup here with pictures but it called for additional Tees & adapters and the author said that there would be a lot more opportunities for leaks as a result. Has anyone found a way that calls for fewer adapters & Tees?
Another concern is the anti-lock stuff is connected to this whole mess and when I remove it to swap in a vac assist will the ABS light be on. I don't care about the functionality of ABS, we've gotten by for years before it came along, but I don't want the light annoying me. Also the reservoir has a fluid level switch and with it gone will the "brake" light be on? I'd sure appreciate it if any of you who have done the conversion would weigh in & advise me.
Thanks,
Chas
Chas K.
88 T-bird, 5 speed, Wiseco pistons, Gillis valve, 255LPH fuel pump, CD, tripminder, RR cam, K&N, 140 MPH speedo conversion (thanks Jeff K).
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Jeff K Offline
Administrator
#2
Blast every suspected area 100% clean with brake cleaner and let it dry completely. Get some baby powder and spray it around the MC, accumulator, lines, reservoir, brake pressure switch, etc. Drive the car, apply the brakes, etc, and have a look. The baby powder will show you where the leak is.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Chas K 88 Offline
Member
#3
Sounds like good idea but I'm not sure I can reach in, it's mighty cramped in there. Sure is worth a shot though, thanks for the idea.
Chas
Chas K.
88 T-bird, 5 speed, Wiseco pistons, Gillis valve, 255LPH fuel pump, CD, tripminder, RR cam, K&N, 140 MPH speedo conversion (thanks Jeff K).
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84TBirdTurbo42 Offline
Senior Member
#4
didnt they make stuff called tracing powder at one time for that exact reason?

make sure everything is really clean when you do it.
Chris Perry
1984 Ford Thunderbird Turbo Coupe. Dead, NY rot killed her
1986 Thunderbird shell, swapping parts from the 84.
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Jeff K Offline
Administrator
#5
^^^^ I think they did, Chris.

Baby powder can be "blown" out of the plastic bottle by squeezing it.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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