Hot Rotors

SHANE BENDERT

MEMBER
1989 CHEVROLET BLAZER
6 CYL
FWD
AUTOMATIC
120,000 MILES

Hey guys-
after a 10 mile drive the front rotors are burning hot. The left side is worse than the right. The calipers, pads, rotors, and rubber hose are relatively new (previous owner). I took apart the left side and the caliper easily moves out (when applying the brakes), but when I try to compress the caliper piston with a C-Clamp it is really difficult. What do you think?
'89 S-10 Blazer

7 Replies

CARADIODOC

MECHANIC
33,916 POSTS

Crack the bleeder screws open, then see if you can push the pistons in. If you can, try the same thing by cracking the steel lines at the master cylinder.

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Friday, March 19th, 2021 AT 12:14 PM

WRENCHTECH

MECHANIC
20,761 POSTS

I would be pretty suspicious why all that stuff was changed. This has the symptoms of a contaminated system. Run the test that Caradiodoc suggested. I'm suspecting you will find a bad master too and maybe rear problems at a later date.

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Friday, March 19th, 2021 AT 12:14 PM

SHANE BENDERT

MEMBER
2 POSTS

With a C-Clamp appying pressure on the Left side Caliper piston I cracked the front brake line at the Master Cylinder and only a small amount of fluid came out (minimal pressure). I then cracked the bleeder screw on the Caliper and again only a little fluid came out. I removede the Caliper and a the Piston boot has a visable hole about 1mm diameter. I looked under the boot and there is evidence of corrosion. I replaced both Calipers ($13 each at Murray's Auto). The pedal isn't as firm as I would like it, but bleeding brakes by yourself isn't the easiest. I'll let you now if this solves the problem. FYI- the front brakes definately lock up much faster than the rear. Thanks for the help.

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Friday, March 19th, 2021 AT 12:14 PM

WRENCHTECH