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Matt, Engineer - BEng Hons
Category: Porsche
Satisfied Customers: 21631
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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1987 porsche 944. Engine running, engaged in first gear,

Customer Question

1987 porsche 944. Engine running, engaged in first gear, release the clutch and car moves forward a few feet then wheels seize and car will not move
Submitted: 1 year ago.
Category: Porsche
Expert:  Matt replied 1 year ago.


If the brakes are binding then

I'd strip the calipers down and check that the pads are in square and true with no debris in the mounting slots, also inspect the caliper mounting faces for any dents, burrs, or debris which would cause them to be bolted up out of true, also remove the disc and do the same for its mounting face on the upright and inside the disc.

If you still havean issue then it could be a flexible brake line has partially collapsed and isproducing a one way valve, this can't always be seen from the outside but youcan test to see if there's any residual pressure in that caliper by crackingoff the bleed nipple after stamping on the brake a few times

Anotherpossibliity is that one caliper is sticking slightly so the piston isn'tretracting on its seals

in which case that caliper will need rebuilding with new seals or replacing

One other thing to try is to remove the master cylinder again and have your assistant push down on the brake pedal to expose the pushrod as it exits the servo

on the end of the pushrod there should be a little adjustment nut

try screwing thisin a turn or two and put it all back together

this adjustmenttakes out free play at the pedal so its better to have a little bit of playrather than too tight

Customer: replied 1 year ago.


I like the idea of the brakes but if i shut the engine off and go through the process again, it will again move but then it might move more or less. So my question is - can I rule out a clutch or CV issue?

Expert:  Matt replied 1 year ago.


I'd say brakes are more likely

but if you can drop the clutch completely with it in gear and the engine doens't stall and continues to run then, yes its a clutch issue as if the clutch was OK then this would stall

and if you have a broken CV joint then you can look under the car to view teh drive shaft and see if 1 is spinning with the car in gear

Customer: replied 1 year ago.

OK. Thank you. one more follow up. To test the brakes, could I put the car on jack stands and try spinning the wheels. If there were brake issues wouldnt they catch then?

Expert:  Matt replied 1 year ago.

Thats quite true

with no pedal pressure and hanbrake off then each wheel should turn freely

might be worth stamping on the brake pedal beforehand to ensure that the brakes have retracted correctly

Expert:  Matt replied 1 year ago.


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