I've been coming home from work (~25 mins, highway) with a on/off hot rim on the rear drivers side. Car is a 2009 VW Rabbit. It has that signature burnt smell and the rim is very hot to the touch.
- Bad bearing, replaced 2 years ago (October) w/ MOOG bearing ass.
- New pads, rotors last year
- Wub wub wub sound similar to a bad bearing at generally all speeds, but is the worst at about 55 mph. This however does not get better or worse by shifting weight to one side or the other.
- Some high pitched squeeking at low speed, but only occasionally, making it very difficult to diagnose and poinpoint. Assuming it's coming from that wheel though.
- Rotated tires a few times since then, sound and heat are still present
- Appears to pull to the left slightly. Possibly an alignment issue?
- Wheel bearing appears to move freely and smoothly, no play in the bearing, no crunchiness.
- E-brake lever (on the caliper) can be squeezed and retracts on its own
- Pads don't appear to be significantly worn, nor is there any wearing on the inside vs the outside.
- Pins run smooth and are easily contracted/retracted.
Thinking it's the pads sticking, judging by the difficulty of putting them in and out, I filed the rust out of the mounting brackets today, not all the way to bare metal, but enough to get the original dimension back. Hoping that this fixes the issue, but not sure what to do after this.
So my question: Am I heading down the right path and what should I do next if this doesn't work? My thought is that the caliper may be bad and not retracting. I'm not sure how to diagnose this though. The Rabbit has the turn and push type plungers, so it's difficult to tell the resistance. I will say that doing the brakes on my wife's Prius, the Rabbit's plungers go in much easier.
Thanks ahead of time!