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Old 06-02-2011, 23:59   #1 (permalink)
93 Aerostar XL 4.0L V6
 
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Smoke/Burning smell from wheel well...Caliper?

I have a 93 Aerostar RWD 4.0L that I was driving around town a few weeks ago and I noticed it wasn't braking that well. The pedal is usually firm but easy to push and very sensitive...instead it was a lot firmer and didn't brake as quickly when i put my foot down. The van itself felt a little under powered, like something was holding it back and I had to put my foot down a lot more to get it up to speed. After awhile I began getting a really bad burning smell coming in through the driver window. I pulled over and saw small faint lines of smoke coming out of the front driverside wheel well, upon closer inspection I got a good wiff of burnt brake pad (I am familiar with the scent) and the hub cap on the wheel was really hot. I automatically assumed the caliper was ceased. Later when I had free time took the wheel off removed the caliper from the wheel and everything looked fine. I was able to push the piston back in with ease using a C-clamp, but there was a lot of corrosion in and around the piston, I wire brushed it off and greased and cleaned everything up. I took it out since then on a few short trips to the store, everything seemed fine. Today however it happened again, and I began smelling burnt brake pad from the same wheel well. It only seems to happen when I have been driving it for a long time like 30mins to 1hr, short trips everything is fine. Is this the caliper or the Master cylinder? Due to the excessive heat around the wheel hub should i maybe think about replacing the inner and outer wheel bearings as well?
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Old 06-03-2011, 09:16   #2 (permalink)
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Re: Smoke/Burning smell from wheel well...Caliper?

If it's not the calliper or pads sticking , another fault that I have had on other cars is the brake flexible hose collapsing inside and stopping the brake fluid returning , hence holding brake on .If the hub has thrown grease and taken a roasting might be worth changing bearings for peace of mind .
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Old 06-03-2011, 11:32   #3 (permalink)
93 Aerostar XL 4.0L V6
 
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Re: Smoke/Burning smell from wheel well...Caliper?

Quote:
Originally Posted by R.S.LOGAN View Post
If it's not the calliper or pads sticking , another fault that I have had on other cars is the brake flexible hose collapsing inside and stopping the brake fluid returning , hence holding brake on .If the hub has thrown grease and taken a roasting might be worth changing bearings for peace of mind .
Really? I never knew that could happen with those rubber lines, but they are the original lines. Well I'm probably going to have to replace the steel lines as well there is a lot of rust around where the rubber attaches to the steel lines, I doubt I could get it off without snapping something. Lucky for my though the Master cylinder is right above the wheel so i only have to run a few feet of new pipe.

Thanks for the info. I'm going to replace the rubber lines and maybe pick up a used caliper from the scrap yard just to be sure.
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Old 06-03-2011, 13:07   #4 (permalink)
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Re: Smoke/Burning smell from wheel well...Caliper?

Your going to pick up a used caliper from a scrap yard ? Buy someone else's junk ?
A new one is only $30.00.
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Old 06-20-2011, 13:17   #5 (permalink)
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Re: Smoke/Burning smell from wheel well...Caliper?

Had that too on my 93. It was not the caliper piston but the "slide pins" that let the other half move which were corroded/stuck. The slide pins look like [] with rubber in the middle. But if it got that hot, I'd replace the pads, caliper, and wheel bearings, too. Then do the other side. Joel
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