Quote:
Originally Posted by Phillytwotank
On the lift I couldn't tell that there was any problem.
Set out to go home and the brakes felt mostly normal for a while.
After the unused the brakes a few times the sticking feeling returned
Unable to maintain speed, smell of brakes, rapid slowing when in neutral, hard pedal
But no pulling... So it seems that it would be all breaks sticking evenly.
Master cylinder?
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Can you tell which Wheel or Wheels is getting hot?
When the Car is Jacked up someone has to start the Engine and step on the Brakes a bunch of times. Then you rotate the Wheels by hand and see if they release only a minimum of drag after you rotate the Wheel/s.
If it is a internally collasped Hose issue Brake Fluid won't spurt when you loosen the Brake Line at the Master Cylinder but (after you pump the brakes somemore) the Brake Fluid will spurt out when you loosen the Caliper Bleed Screw.
When the Square cross section O-ring/Piston Seal gets hard an inelastic the Piston will not return like it is supposed to. Deflection of the Rubber O-ring is the only spring action available to pull the Caliper Piston away from the Rotor.
Gunk between the Piston and the Caliper can do the same or a combination of both.
If the Brake Pads are thin and the Caliper Piston is sticking out abnormally far it also does not want to return easily.
See post #5 for a pic on how the O-ring deflection returns the Caliper Piston
1983 240d manual all 4 calipers not retracting