Brake issues - NEED HELP ASAP

[Built1987]

have a 1987 5.0 GT - foxbody....sweet ride, just having a few issues


when i presso nthe brake, the lights only come on once in a while... the brake lights that is. i got pulled over twice in once day,

also, when i press down on the brakes, it makes a "WOOSHHH" sounds, like air is being pressed out. what can i do? how do i fix it.... thanks all for the help.

 

[Shakerhood]

I would have a look at the brake light switch, it is mounted under there with the brake pedal, the woosh is probably coming from the brake booster.

 

[Built1987]

I would have a look at the brake light switch, it is mounted under there with the brake pedal, the woosh is probably coming from the brake booster.

Thanks for the help. Which switch should I be looking into. There is 4 of them online at autozone. Also. Do you think I need to replace the booster or tighten it up?

Thanks in advanced.

 

[HISSIN50]

Agreed with Shakerhood.
You might need to match up your old switch to the new one if there are that many choices.

There are not many other options than replacing the booster.

 

[Built1987]

Anyone have a DIY for the brake light switch. I'm not sure I understand where to look for it. It's attached to the pedal? Or somewhere in the dash? Thanks all

 

[jrichker]

Power brake booster test:
1.) Check engine vacuum you should have 14"-18" of vacuum at 625-750 RPM, 18"-21" vacuum at 1000 RPM.
2.) Vacuum checks good, start car and run engine up to 1000 RPM for 30 seconds.
3.) Cut off the engine and then press the brake pedal 3 times. It should get harder to press and travel less each time you press it. If it doesn't, then the brake booster is suspect.

 

[HISSIN50]

FWIW, I only see one switch on AZ's site. You might have been looking at the generic switches (there were several).

The Mustang switch listed when I look (YMMV) is Duralast F4837

Do you have a Haynes manual? It might have the info for the switch R/R (I know the 94+ manual does for SN95's, but can't remember if the fox manual has the corresponding fox info).

 

[Shakerhood]

Hissin is correct as there is only 1 style brake light switch for your car, in 94 the switch changed design and has a 90 degree bend for extra clearance.