Hot Rotors

Tiny
SHANE BENDERT
  • 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

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Saturday, March 5th, 2011 AT 8:59 PM

16 Replies

Tiny
CARADIODOC
  • EXPERT
  • 28,246 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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Saturday, March 5th, 2011 AT 9:13 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,781 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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Saturday, March 5th, 2011 AT 9:36 PM
Tiny
CARADIODOC
  • EXPERT
  • 28,246 POSTS

I was thinkin' fluid contamination too but didn't want to bring that up yet as it can really ruin a guy's day.

Happy Saturday, Wrenchtech

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Saturday, March 5th, 2011 AT 10:00 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,781 POSTS

LOL. It is what it is.
Thanks Doc

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Saturday, March 5th, 2011 AT 10:56 PM
Tiny
2CARPROS KEN
  • ADMIN
  • 7,797 POSTS

Check the rod that pushes the master cylinder plunger from the power brake booster, it sounds like it is too far out and not allowing the brake master to fully release. Please let me know, Thanks for using 2carpros. Com

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Sunday, March 6th, 2011 AT 5:01 AM
Tiny
SHANE BENDERT
  • MEMBER

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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Sunday, March 6th, 2011 AT 11:05 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,781 POSTS

So much for the new calipers you said you had.

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Sunday, March 6th, 2011 AT 11:08 PM
Tiny
DPOWELL48
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 84,000 MILES

Do I have to clean new brake rotors before using them

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
FIXITMR
  • MEMBER

Is it that big a job? But I have to admit, I dont usually do it.

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
DPOWELL48
  • MEMBER

Thank you fixitmr! I agree it is not that big of a job. I would like to know if it is true that not cleaning new rotors will cause lot of white smoke as I was told if the new rotors are not cleaned because of the film that is on the new rotors to protect them.

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
FIXITMR
  • MEMBER

I dont recall anything like that happening but I dont change that many rotors and get to see the results anyway? Like they say, there's 1 way to find out! Have fun!

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
  • 31,132 POSTS

Clean the disc's, the anti rust coating can cause poor bed in for the new pads, and brake squeal, wash down with a brake clean and you will not have a problem.

Mark (mhpautos)

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
DPOWELL48
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 84,000 MILES

Thank you fixitmr! I should have asked is it true that not cleaning brand new rotors will cause excessive amounts of white smoke because of the protectant on the new rotors. Thanks again

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
DR. HAGERTY
  • EXPERT
  • 9,737 POSTS

I will tell him.

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Monday, December 19th, 2016 AT 4:13 PM (Merged)
Tiny
HAWKEYS
  • 1998 CHEVROLET BLAZER

Brakes problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic

Is there a trick to getting off the rear brake rotor? It seems loose but I can't get it off. Is there something holding it on?

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Monday, December 19th, 2016 AT 4:14 PM (Merged)
Tiny
ZACKMAN
  • MEMBER

Yes. Rust and road grimes. Spray some rust catalyst such as PB Blaster (WD40 does not work as good). Wait 5-10 minute, and use rubber mallet to tap it out.

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Monday, December 19th, 2016 AT 4:14 PM (Merged)

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