emergency brake light wont go off

[Guss]

any one know how to reset the brake light in a 90 blazer
replaced the brakes and rotors back not even close to worn.
but i wore the fron way farther than i sould have now brake light wont go off.
do i just disconect the battery for a period and if so how long?

 

[dyeager535]

Only two things trigger the brake light: Switch at the brake pedal is messed up, or the proportioning valve has turned it on. OK, three: wiring issue.

 

[dremu]

any one know how to reset the brake light in a 90 blazer
replaced the brakes and rotors back not even close to worn.
but i wore the fron way farther than i sould have now brake light wont go off.
do i just disconect the battery for a period and if so how long?

Is it *blinking*, or on steady?

If it's on steady, you're low on brake fluid or the p-valve (as Dorian points out) thinks you are, the switch on the parking brake is horked, or there's a wiring problem.

If it's blinking, that's an ABS code and is a whole other ball of wax.

-- A

 

[Leper]

unplug the controller near the master cylinder and plug it back in. Fixed 2 trucks this way. Check the fluid level. Flushing the brakes not a bad idea either.

 

[JIMs70K25]

Not sure if it's the same but on both my 70s, I had to brake hard to reset the p-valve, and the light went out. Also the wire could be disconnected from the p-valve.

 

[Guss]

ok its a solid light and i checked the wire on the portioning valve witch
A. conected tightly
B. free of corrosion
but i know my e-brake pedal does work( doesnt lock when applied) ill check the switch there and let you guys know.

 

[Guss]

got the e-brake to latch now working. light still on and only gets brighter
when e-brake is pushed. i pulled the release and it stays on but dims
cheked switch and found no problems
AAAAAAAHHHHHHH!

 

[Rob 85K5]

...you're low on brake fluid...

Check your fluid.

 

[Guss]

fluid is full and pretty clean

 

[Guss]

what do you mean unplug next to master cylinder? are you talking about
the sensor?

 

[dremu]

what do you mean unplug next to master cylinder? are you talking about
the sensor?

1990-91 R and V series trucks (don't ask, but it includes your Blazer, presuming it's a full-size) have rear-wheel anti lock brakes, aka RWAL or ABS.

There's a black plastic box somewhere around your master cylinder, which is the computer that controls this mess... that's why I asked if it was a BLINKING light, indicating a problem with this system, or a SOLID light, generally indicative of the rest of the (normal) system.

-- A

 

[Guss]

ok ill try unplugging i thought it was the ecm the battry reset wont work for this though?

 

[Guss]

1990-91 R and V series trucks (don't ask, but it includes your Blazer, presuming it's a full-size) have rear-wheel anti lock brakes, aka RWAL or ABS.

it worked thanks alot

 

[Leper]

what do you mean unplug next to master cylinder? are you talking about
the sensor?

I was assuming your 90 looked like my 91. There is a controll unit mounted my master cylinder with a couple of large connectors on it.

 

[91BurbDude]

I have a 91 Burb with this same problem. I also checked the e brake switch but found the same thing that when the e brake release is pulled the light stays on but not as bright. I will try the unplugging thing tomorrow. I knew if I searched the forums I would find someone with the exact problem I have! LOL

 

[pauly383]

I had to reach under mine Monday , and hammer the bracket back in place , and tug tje cable a bit to free it , so my pedal would go back up and turn the light out ...... *** **** ROCKS

 

[Guss]

just reset the computer on the master cyl. and it will be fine