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Posted by: Ansbacher Mar 17 2021, 12:37 PM

Anyone know the torque spec for the 19 mm caliper retaining bolts on the rear brakes? Car is a '74 2.0 . Thanks.

Ansbacher

Posted by: mepstein Mar 17 2021, 01:12 PM

Really tight. Just kidding sort of. It's a tough spot to put a torque wrench on.

Posted by: JeffBowlsby Mar 17 2021, 01:39 PM

According to the Tech Specs book:

M12 x 1.5 x 30? 7.0 ft lbs

Posted by: 914e Mar 18 2021, 12:48 AM

Posted by: bdstone914 Mar 18 2021, 06:54 AM

I cant believe it is 7 ft lb. Did you add a decimal in error?

@http://www.914world.com/bbs2/index.php?showuser=104

Posted by: Mark Henry Mar 18 2021, 07:54 AM

The spec is "good 'n tight"!

Posted by: JeffBowlsby Mar 18 2021, 08:17 AM

You're right Bruce I should have questioned that.

Turns out its more likely "7.0 mkg" = 50 ft lbs.

Of the several torque value tables in the Tech Specs book, only one has the units mkg indicated all other tables do not show units.





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Posted by: Ansbacher Mar 18 2021, 10:45 AM

Thanks everyone for clearing this up. Now, if I could just find my torque wrench....

Ansbacher

Posted by: brant Mar 18 2021, 10:47 AM

also... don't the rear calipers have the locking tab... that prevents those bolts from loosening....

I never use a torque wrench on them
good and tight has always worked.
and then the lock tabs
b

Posted by: mepstein Mar 18 2021, 11:15 AM

Yes, Mark said it well. Good and tight.

Posted by: bdstone914 Mar 18 2021, 01:23 PM

@http://www.914world.com/bbs2/index.php?showuser=47

Fronts have the lock tabs. I toss them and use wave washers like all other Porsche calipers use
Rears have the backing plate strap that goes between the caliper rear and trailing arm. If left out the caliper rubs.

Posted by: iankarr Mar 18 2021, 01:42 PM

Backing plate strap?

Posted by: brant Mar 18 2021, 03:05 PM

good point.. and I wasn't very clear.
I was thinking the rear backing straps too

I just use split washers on my front calipers also.