North American Turbocoupe Organization



Confused Brake issue
Lunysgwen Offline
Junior Member
#1
I've frequently used the articles here to help diagnose and fix issues with my T-bird, as does my father, (Who hooked me and convinced me to become a member also.) and typically with good results, but now I'm confused.

I have a Red Light/Yellow Light brake light, and hard pedal, which by the article on the tech page, is a bad pump relay (Or pump.). Now, it says the relays are under the vac tree, which is easy to locate. There are two there, and both of them have -five- wires, and not four as described in the article. Nor are they round as the picture shows.

Are these still the correct relays? If someone could clarify, or put up a picture of some kind, I'd appreciate it.
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Pete D Offline
Administrator
#2
Locate the pump relay in the plastic housing under the vacuum tree. It should be the front relay, having GY/Y, T/Y, GY/R, and PK/LB wires going to the relay socket. Remove the relay from the plastic housing, and remove the relay from its socket.

The round thing in the article is the, that I see is the pump motor connector, not a relay. Maybe I'm looking at the wrong diagram

Check your email. See ABS 3.jpg, lower center
Pete Dunham


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Lunysgwen Offline
Junior Member
#3
Thank you, Pete. The wiring diagrams confirmed what I was looking at, and since I had some extra parts from previous T-birds laying around, I put in a used relay to see if that fixed the issue. It seems to thus far, I haven't taken it out of the driveway yet.

Even if it did fix the issue, I'm still going to be scared of driving the car for a long time. I got lucky this time with it messing up just as I was ready to pull in.
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Matt S Offline
Posting Freak
#4
You might want to do a good inspection of the wires, maybe even plug the old relay back in to see if it works now. That would give you peace of mind that it's not an random wire short or connection problem. If the relay swap did fix it, I suggest buying a new one and keeping the one you knows works in the trunk somewhere. I personally completely trust the electric braking system.
Sold it Sad*
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Pete D Offline
Administrator
#5
Lunysgwen, those relays going bad are not uncommon.
There are past posts on it. Do what Matt suggested and swap the old one back in. Then put a new one in.
See:
http://natomessageboard.com/ultimatebb.p...063#000000

http://natomessageboard.com/ultimatebb.p...054#000000
Pete Dunham


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Lunysgwen Offline
Junior Member
#6
Pete - Matt: Thank you for the advice and the links to the other threads.

So - An update to what has occurred.

I drove it out of the driveway two days ago, worked good for a few seconds and it went out. A loud sigh and I parked it for the day, got ready for work, and borrowed a vehicle (Had a backup plan just incase.) and let it sit sunday, getting through the time-lag of setting my clock an hour forward 3am in the morning.

Get up today, and fiddle with it again. Jumpered the relay, pump ran fine. Scratched my head, sighed again, and then a spark went off under the relay connection. Two exposed wires were touching one another - That certainly can't be good.

Some electrical tape later, two zip ties, and a quick run around the neighborhood said the pump was running great. Still wary, but I'll take it easy on the road.

Conclusion (TL;DR): If it happens again, mustang brake cylinder goes in, and ABS goes out.
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