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Topic: I broke the valve under my brake master cylinder - 88 Turbo Coupe (Read 1191 times) previous topic - next topic

I broke the valve under my brake master cylinder - 88 Turbo Coupe

There's some sort of valve under my brake master cylinder assembly in my 88 Thunderbird Turbo Coupe.  It has a couple lines that come in from above an 2 lines that come out from the bottom.  When trying to remove one of the bottom lines, I broke the electric sensor off of it so now I have to replace it, but I don't know the best way to get it out.
What is the thing under my Turbo Coupe master cylinder assemby called?
What does it do?
What does the sensor attached to it do?
What's holding it in place?  I cant find a bolt on it anywhere.  Waht's the best way to get it out?

I broke the valve under my brake master cylinder - 88 Turbo Coupe

Reply #1 –
porportioning block? there should be a steel bracket holding it.  dig alittle deeper.

I broke the valve under my brake master cylinder - 88 Turbo Coupe

Reply #2 –
I'm pretty sure the sensor is for low brake fluid/pressure.

I broke the valve under my brake master cylinder - 88 Turbo Coupe

Reply #3 –
I think it's a pressure differential switch - it makes the light come on if one of the brake systems (front/rear) loses pressure. That's what it is in a non-TC anyway - not so sure about the ABS-equipped TC.
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

I broke the valve under my brake master cylinder - 88 Turbo Coupe

Reply #4 –
It's your proportioning valve

The sensor is a pressure switch and monitors brake pressure when the pedal is applied. If it senses unequal pressure when the pedal is applied, the switch closes and trips your brake warning light.

I broke the valve under my brake master cylinder - 88 Turbo Coupe

Reply #5 –
Thanks everybody.  Being a fluid pressure sensor I guess I'm gonna have to replace it or try to find a way to fix it so I don't have fluid pouring out the side.
The bigger problem is advance, autozone, ect. don't have it and all salvage yards nearby have sped everything before 93 so getting a hold of one could become a problem if I can't repair this one.
Thanks again. :)