1990 GMC Jimmy Continuous brake light.
Question:
- Hide quoted text — Show quoted text -> > The first thing that I would do is bleed the brakes again and make sure > that > > the perportioning valve gets centered. That’s probably all you’ll need > to > > do, but it’s possible that when you gave it the old panic stop the > > perportioing valve went south on ya. > > nospam > Now if I remember "centered" is with the little ‘thingy’ pushed in? And > now > is this proportioning valve the distribution block that I am thinking of > up > towards the front of the truck? I also can’t remember how the last guy who > had trouble with this valve determined if it was broken? > ~KJ~ > Now that would be me my good man, AFAIK I was the last one on the ng to go > though the proportioning valve hell. The proportioning valve is likely > located just beside your master cylinder, and will be aluminum with a little > yellow electrical connector on the top of it. That little bastard connector > is what tells the brake light to come on. > To verify it’s the prop valve sensor and not the emergency brake sensor > out-of-whack, make sure the brake light is on, and pull the yellow > connector. If the light stays on, it’s the emergency brake sensor.
Light went out… > Lemme guess, you aggressively bled the rears with the ass end of the vehicle > jacked up right? That’s what killed my last one. My symptoms were ZERO > front brakes, brake light would illuminate when I smashed the pedal and then > remain on until I turned the truck off. > HTH, > Doc
No, truck stops alright. I think the rears aren’t working…. any suggestions? ~TLGM
Response:
I wouldn’t say my girl was aggressive with the brakes, but it *was* jacked up (as little as possible however, maybe 2" higher then my tires would keep it). It’s stopping just fine, so if anything it’s the rears that aren’t working. It doesn’t go away ever (there on start up), unless I engage the e-brake, and disengage. Then when I use the brakes again with any force, it comes back on…. ~KJ~
– Hide quoted text — Show quoted text -> > The first thing that I would do is bleed the brakes again and make sure > that > > the perportioning valve gets centered. That’s probably all you’ll need > to > > do, but it’s possible that when you gave it the old panic stop the > > perportioing valve went south on ya. > > nospam > Now if I remember "centered" is with the little ‘thingy’ pushed in? And > now > is this proportioning valve the distribution block that I am thinking of > up > towards the front of the truck? I also can’t remember how the last guy who > had trouble with this valve determined if it was broken? > ~KJ~ > Now that would be me my good man, AFAIK I was the last one on the ng to go > though the proportioning valve hell. The proportioning valve is likely > located just beside your master cylinder, and will be aluminum with a little > yellow electrical connector on the top of it. That little bastard connector > is what tells the brake light to come on. > To verify it’s the prop valve sensor and not the emergency brake sensor > out-of-whack, make sure the brake light is on, and pull the yellow > connector. If the light stays on, it’s the emergency brake sensor. > Lemme guess, you aggressively bled the rears with the ass end of the vehicle > jacked up right? That’s what killed my last one. My symptoms were ZERO > front brakes, brake light would illuminate when I smashed the pedal and then > remain on until I turned the truck off. > HTH, > Doc
Response:
– Hide quoted text — Show quoted text -> The first thing that I would do is bleed the brakes again and make sure > that > the perportioning valve gets centered. That’s probably all you’ll need to > do, but it’s possible that when you gave it the old panic stop the > perportioing valve went south on ya. > nospam > Now if I remember "centered" is with the little ‘thingy’ pushed in? And now > is this proportioning valve the distribution block that I am thinking of up > towards the front of the truck? I also can’t remember how the last guy who > had trouble with this valve determined if it was broken?
centered has nothing to do with the ‘thingy’ pushed in, the purpose of the ‘thingy-pushing-in’ is to make it easier to bleed it is centered when pressures come up equally in both systems it has a single wire coming off it
Response:
– Hide quoted text — Show quoted text -> The first thing that I would do is bleed the brakes again and make sure > that > the perportioning valve gets centered. That’s probably all you’ll need to > do, but it’s possible that when you gave it the old panic stop the > perportioing valve went south on ya. > nospam > Now if I remember "centered" is with the little ‘thingy’ pushed in? And now > is this proportioning valve the distribution block that I am thinking of up > towards the front of the truck? I also can’t remember how the last guy who > had trouble with this valve determined if it was broken? > ~KJ~
Now that would be me my good man, AFAIK I was the last one on the ng to go though the proportioning valve hell. The proportioning valve is likely located just beside your master cylinder, and will be aluminum with a little yellow electrical connector on the top of it. That little bastard connector is what tells the brake light to come on. To verify it’s the prop valve sensor and not the emergency brake sensor out-of-whack, make sure the brake light is on, and pull the yellow connector. If the light stays on, it’s the emergency brake sensor. Lemme guess, you aggressively bled the rears with the ass end of the vehicle jacked up right? That’s what killed my last one. My symptoms were ZERO front brakes, brake light would illuminate when I smashed the pedal and then remain on until I turned the truck off. HTH, Doc – Hide quoted text — Show quoted text –
Response:
> The first thing that I would do is bleed the brakes again and make sure that > the perportioning valve gets centered. That’s probably all you’ll need to > do, but it’s possible that when you gave it the old panic stop the > perportioing valve went south on ya. > nospam
Now if I remember "centered" is with the little ‘thingy’ pushed in? And now is this proportioning valve the distribution block that I am thinking of up towards the front of the truck? I also can’t remember how the last guy who had trouble with this valve determined if it was broken? ~KJ~
Response:
– Hide quoted text — Show quoted text -> 1990 GMC Jimmy > Disc front, drum rear. > AFAIK stock braking system. > I went through all my brakes about 2 weeks ago > 1: replaced all pads/shoes. > 2: Replaced front calipers, rear pistons. > 3: Replaced hard lines that run along rear drive shaft. > 3: Had 0 problems bleeding system, AFAIK. > Truck stops well, very well indeed. However even when I did my first "panic > stop" test when I was really after the brake the brake light came on. It > continued to turn on JUST when I was REALLY after the brake. However now it > is on all the time. > I can’t see any leaks, but I haven’t inspected the entire brake system super > close. The main reason is – I can’t see the level in the resevoir going down > at all, and it stops very well. > I can only thing it’s a bubble in the system, but if the truck thinks there > is something wrong I’d like to fix it. > ~KJ~
The first thing that I would do is bleed the brakes again and make sure that the perportioning valve gets centered. That’s probably all you’ll need to do, but it’s possible that when you gave it the old panic stop the perportioing valve went south on ya. nospam
Response:
1990 GMC Jimmy Disc front, drum rear. AFAIK stock braking system. I went through all my brakes about 2 weeks ago 1: replaced all pads/shoes. 2: Replaced front calipers, rear pistons. 3: Replaced hard lines that run along rear drive shaft. 3: Had 0 problems bleeding system, AFAIK. Truck stops well, very well indeed. However even when I did my first "panic stop" test when I was really after the brake the brake light came on. It continued to turn on JUST when I was REALLY after the brake. However now it is on all the time. I can’t see any leaks, but I haven’t inspected the entire brake system super close. The main reason is – I can’t see the level in the resevoir going down at all, and it stops very well. I can only thing it’s a bubble in the system, but if the truck thinks there is something wrong I’d like to fix it. ~KJ~
