Parking Brake Light

The place to discuss problems and routine maintenance questions and tips that are NOT specifically diesel-related.
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science
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Location: Greensboro, NC

Parking Brake Light

Postby science » Mon Apr 16, 2018 9:31 am

Quick question: when braking, my parking brake light comes on. I feel like I used to know what this was caused by, but I cant remember. Can someone job my memory?
1981 Chevy Luv 2.2L Diesel -- on grease
1982 Isuzu P'up 2.2L Diesel

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puttputtinpup
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Location: Winston Salem, NC

Re: Parking Brake Light

Postby puttputtinpup » Mon Apr 16, 2018 2:56 pm

Check brake fluid level in master cylinder. Follow the brake lines from the master cylinder down to a metal block. 2 lines in, 2 lines out. Should be a sensor on the metal block which is called a proportioning valve. Is pressures going out are unequal, a valve will slide to one side and turn on the light

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puttputtinpup
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Re: Parking Brake Light

Postby puttputtinpup » Mon Apr 16, 2018 3:16 pm

You can unplug that sensor and see if that prevents the light from coming on.
Rear brakes could be worn and auto adjustment not working. Is the pedal very low when braking?

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puttputtinpup
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Re: Parking Brake Light

Postby puttputtinpup » Mon Apr 16, 2018 3:17 pm

Or simply low on fluid in one of the reservoirs. Is this my old truck, or the LUV?

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science
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Location: Greensboro, NC

Re: Parking Brake Light

Postby science » Mon Apr 16, 2018 5:41 pm

It's the LUV. I'm rolling this around in my brain and starting to think it's because the parking brake bushings are seized and I never use it. Guess it's time to make some new bushings for it. In all my spare time. Oh well, once I get the clutch done on the PUP (a.k.a. your truck, a.k.a. 'the babe magnet' because it's not a rust bucket) i'll start on that.

Yes the pedal gets pretty low. However it hasn't been that long since I did a complete brake job on the truck. Rear brake adjustment seems the likeliest.

Thanks for pointing out the proportioning valve.
1981 Chevy Luv 2.2L Diesel -- on grease
1982 Isuzu P'up 2.2L Diesel

User avatar
puttputtinpup
Regular Member
Posts: 10217
Joined: Sat Oct 08, 2005 5:18 am
Location: Winston Salem, NC

Re: Parking Brake Light

Postby puttputtinpup » Tue Apr 17, 2018 12:45 am

Amy, the little Pup shouldn't need a clutch yet. I put a new clutch, pressure plate, release bearing and heavy duty pilot bearing in it not long before you bought it.


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