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Old 08-14-2019, 03:36 PM   #1
jowinp
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Siezing rear driver side brake caliper. I've replaced everything

Hi
I have a 01 325i. it sat for a while and i decided to make it my daily and started cleaning it up. I replaced the front pads and rotors and shocks and struts and springs and the list goes on.

But then the car felt weird. At first i though one of the tires might have a flat spot as it was sitting for a few months. Replaced all 4 tires. still the same.

Then it started making this metal on metal grinding noise and after a 20 min drive the pedal would get really spungy. I checked the rear brake pads and the driver side was finish to the bone but the passenger side was still almost brand new. Replaced rear Rotors, brake pads, calipers, brake lines. Issue still exist, Replaced Master cylinder and flushed and bleed the brake fluid but issue is still there.

When i drive the rear driver side gets supper hot and i can feel that it is stuck
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Old 08-14-2019, 06:54 PM   #2
DEADF15H
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Location: Boca Raton, FL or Salisbury, NC
Posts: 2,176
My Ride: 2001 325i Auto
Model: 325i
Transmission: Auto
What brand is the new caliper? Slide pins getting stuck. ?

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Last edited by DEADF15H; 08-15-2019 at 02:47 AM.
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Old 08-15-2019, 08:54 AM   #3
jowinp
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I got the OEM calipers rebuilt from rockauto.com. What i find weird is that its only happening on one wheel. The other side wears normal and runs fine
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Old 08-15-2019, 08:55 AM   #4
jowinp
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Quote:
Originally Posted by DEADF15H View Post
What brand is the new caliper? Slide pins getting stuck. ?

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I got the OEM calipers rebuilt from rockauto.com. What i find weird is that its only happening on one wheel. The other side wears normal and runs fine
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Old 08-15-2019, 09:24 AM   #5
DEADF15H
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Location: Boca Raton, FL or Salisbury, NC
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My Ride: 2001 325i Auto
Model: 325i
Transmission: Auto
I'm no expert and maybe someone else can chime in.
When the brake pedal is released, hydraulic pressure drops and the calipers loosen their grip. Square cut seals around the caliper piston deform when the piston moves out , so when pressure is released the seals want to return back to their original shape. The piston retracts.
The caliper guide pins are two round metal pins on each brake caliper where the brake piston assembly sits and moves.
You need to remove the caliper and check their operation. Sounds like it's sticking somewhere. My guess is the piston or pins aren't retracting completely or in a timely fashion. Rebuilds don't always work. I'd try an exchange.
Also compare it to the one you took off. Check for scoring on the caliper and pins. You can push the calipers out with an air hose. Check YouTube for a caliper rebuild video for instructions.

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Last edited by DEADF15H; 08-15-2019 at 09:48 AM.
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