right rear caliper stuck

Discussion in 'Gen 1 & 2 - Suspension, Brake Systems, & Body' started by tommyturbo, Aug 15, 2020.

  1. tommyturbo

    tommyturbo SHO Member

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    Driving home today (95 mtx) I started hearing a funny groan from rear of car just before getting home, when I got home, right rear rotor was cherry red and rim has been discolored and smoking. So looks like right rear caliper decided to stick. Anyone else have this happen and have a probably cause to the issue to check? gonna try to find a good slicer and cap now for a right side 95 rim.
     
  2. zoomlater

    zoomlater SHO Member Supporting Member

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    it could be a collapsed brake line (internally if you have rubber hoses) or a stuck e-brake line. I had a 95MTX where the right side failed
     
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  3. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    From my experience, if it locks up tight enough to get the rotor red hot, it's a collapsed brake line. A sticking slide pin or a sticking brake cable won't supply enough constant force to do that.

    First plan of attack would be to remove the hose from the caliper and see if you are getting any fluid out of it. If it's OK you would see a steady drip.

    20200313_214117.jpg
     
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  4. tommyturbo

    tommyturbo SHO Member

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    stupid question, how does a brake line collapse?
     
  5. luigisho

    luigisho SHO Member

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    Usually you can't really see it externally. They can become compromised internally and the inside lining collapses and acts like a check valve choking off pressure in one or both directions. It sounds weird but I have experienced this and there are alot of this issue for this car documented over the years. The only good news is the replacement hose is cheap.

    https://www.ericthecarguy.com/brake-hose-problems/
     
  6. RonPorter

    RonPorter Old Dude

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    Yep, very good chance is a bad rubber line (just replace both), but a stuck slider pin can also do that. Both conditions are very common.
     
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  7. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Picture a clogged artery. It usually happens at the section with the metal band that is clamped to it which attaches to the strut.
     
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  8. wkienzle

    wkienzle New Member

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    The right rear caliper got stuck on my '90 making the rotor toasty hot, much like you experienced. It turned out the grime (or rust) buildup was stronger than the parking brake return spring. I always use the parking brake when parked. Spraying some penetrating oil on the parking brake mechanism at the wheel allowed everything to move freely. Haven't had a problem since. Do you use the parking brake on your mtx?

    Having spare brake lines on hand (as others suggested) for a car this old is also a good idea. Some people claim the service life for the standard brake hoses is 10 years. I have a set of Russell Stainless Steel lines ready to be installed next time I do brake work.
     
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  9. NoSlo

    NoSlo GoldMember

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    Had two different rear calipers stick with the exact symptom, roasting hot disc, douse it with water every mile to get home. Simply replace the caliper, disc, and pads. Also had sticky e-brake line, where instead, the parking brake just doesn't work well as only one side engages.
     
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