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garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

yeah my dad drove it to the paint shop the other day and i was behind him in the truck. he said the brakes were very much lacking and he was afraid the whole drive there. he says if you pump them up a few times, that the pedal gets stiffer, but if you dont it just goes to the floor and its not very good at stopping. we bled the brakes and we seemed to do a good job, but then again i dont think air in the lines would "pump up" and get stiff again. got any idea whats wrong or what i need to fix/replace?

thanks.

oh by the way, on the way to the paint shop, i was behind my dad in the truck. i look at the back left wheel and it is wobbling like its gonna fall off any second. my dad pulled over and we took a look at it and saw there was one lug remaining. before we left we torqued the lugs with the air wrench, i dont see how they came loose, but they did. anyway, we took one lug from 2 other wheels so we had 3 lugs on 3 of the wheels. it was quite a confusing and scary adventure. if that wheel would have fallen off, i would have cried. alot.
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early 77 924 na

Lizard · Posted: Mon Aug 21, 2006 7:59 am Post subject:

never tighten wheel lugs with an impact gun, ALWAYS do it by hand,

as per the brakes lacking, you need to adjust the rear drum brakes and confirm that there is no air in the system

not much would have happened if a rear wheel would have fallen off, as you would have just scrubbed the lower shock and mounting point
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3 928s,

flosho · Posted: Mon Aug 21, 2006 10:03 am Post subject:

Check the brake fluid? Those are the same symptoms I had when my white car(not 924) had a leak in the brake line.
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[This Space For Rent]

Joes924Racer · Posted: Mon Aug 21, 2006 12:00 pm Post subject:

No you wouldnt of cried your face would of got red
& your eyes a lil buggy from the impact of thinken
how stupid it was.. I tighten mine with a lug wrench
and breaker bar a long thick guage white steel pipe
its really thick it might of come from a heavy duty
floor jack its really heavy not to be ignored though
I can get a wheel off and tighten the bearings
or whatever on the front pretty quicke its a work out.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

tj924 · Posted: Mon Aug 21, 2006 2:18 pm Post subject:

Lizard · Posted: Tue Aug 22, 2006 1:07 am Post subject:

lol I know 2 others 924 owners it has happened to, and it is ALWAYS the rear rims,
I almost had it happen to my 924 once, but I knew something wasnt right as soon as two had backed off, got out and checked sure enough two were way to loose, but I know I had tightened them 2 days before, I didnt really think much of it
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3 928s,

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

You know, I'm pretty sure there is even a torque spec for the lug nuts/bolts

Wait, wait, here it comes: for lug bolts, 94ft-lbs for alloy wheels, 80 ft-lbs for steel wheels

Lizard · Posted: Tue Aug 22, 2006 9:46 am Post subject:

I always tighten mine to a tick over 100 ft lbs
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3 928s,

Slam · Posted: Tue Aug 22, 2006 10:42 am Post subject:

Interesting. Mandy's rear lug bolts need to be checked regularly. They tend to back out. And I've been going to 80ft/lbs. Design thing?
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'88 944 Auto - may or may not resurrect

Lizard · Posted: Tue Aug 22, 2006 11:15 am Post subject:

yah cast steel doesnt hold bolts well, unless it gets really hot, ie exhaust, then good luck getting them out
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3 928s,

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Gary, I don't think your brake problem is as simple as air in the lines. I think you need to have a good look at you master cylinder and your servo (booster) cylinder. If there's brake fluid in the booster, it's a M/C overhaul job for you.

And BTW, the brakes are good when they're working properly!

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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Jaf · Joined: 08 Jun 2006 Posts: 194 Location: Oria. Spain

Well, here's my confession...near side front wheel came off on my 924. Felt something was wrong and stopped in the dark and looked at it. Couldn't see a thing and the tyre was a bit flat so drove it a couple of miles to the nearest petrol station. As I was crossing the road to turn into the petrol station the wheel came off and rolled down the road. Oops. Damn lucky I was only doing about 3 miles an hour! Front wing folded up and the brake dic backing plate bent. That was years ago and I've never forgetten to re-check any bolt after that.
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1978 924na

skemcin · Joined: 02 Sep 2003 Posts: 1284 Location: Plainfield, IL

I recently replaced the rear wheel cylinders - so if your brakes are still going and you haven't check that, I'd have a look there.
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924.org (no time to complete)
9249206346 - 89k – new shifter bushings, belts, running well.
9249206347 - 8k – waiting its resurrection, no power at the fuel pump and fuse #7 blows w/power

garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

i just got a huge load of random, useful parts (thanks deisel) and included in that pile was a master cylinder (the plastic peice and the metal thing under it, and the brake booster). Should i just replace that? is it easier than fixing it?

EDIT: i forgot to add, a few months ago, i replaced the rear cylinders, all new pads/shoes, all new hoses, all new rear hardware, and had both rotors turned and both drums turned.
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early 77 924 na

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

How far did you go getting the discs turned down?

There is a minmum thickness spec on them (can't remember what it is).
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org