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Old 27-10-2014, 06:20 PM   #1
58bug_1
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Default Brake Pedal Vibration after a routine tire change

1958 beetle delux 1200 6v (standard 165/80/15)

I recently had a new set of tires fitted and found my brake pedal vibrating (pumping in and out)

The vibration increases and decreases with speed. No other vibration or noise during driving. Only on the brake pedal when breaking.

The breaks were spoton before the tire change. I've asked a aircooled specialist in London who simply wants to change the breakdrums and master cylinder which seems completely dramatic.

Any idea why a simply tire change can cause this?

Thanks alot
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Old 27-10-2014, 06:28 PM   #2
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It sounds like the tyre fitter's been a bit ham fisted tightening the wheel bolts and has not tightened them evenly warping a drum. Wide 5 drums can be quite easy to distort and the bolts should be tightened gently and bit by bit.

You may be looking at replacing drums and shoes (to match the new drums), no idea why he'd want to replace the m/cyl though.
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Old 27-10-2014, 08:52 PM   #3
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Probably a silly question.... You've made sure the bolts are tightened properly?
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Old 28-10-2014, 12:16 AM   #4
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Whs. ^^^

Drums will need changing
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Old 28-10-2014, 01:17 AM   #5
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loosen all your wheel nuts and re-torque
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Old 28-10-2014, 04:08 PM   #6
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Quote:
Originally Posted by Manxdavid View Post
It sounds like the tyre fitter's been a bit ham fisted tightening the wheel bolts and has not tightened them evenly warping a drum. Wide 5 drums can be quite easy to distort and the bolts should be tightened gently and bit by bit.

You may be looking at replacing drums and shoes (to match the new drums), no idea why he'd want to replace the m/cyl though.
A Tyre fitter being ham fisted when fitting wheel bolts??? Never! :
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Old 28-10-2014, 09:20 PM   #7
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5 bolt Beetle drums are not as rigid as you may think. Warped roadwheels will easily distort a drum when tightened, but the warp isn't permanent. Before spending money on new drums or having them skimmed, try to identify which one is vibrating, and change the wheel. Or change each one in turn, until the vibration goes, then get the offending wheel checked. The equipment in modern tyre bays often can't accomodate the VW 5 bolt wheels, so the fitters "improvise", and this can cause damage.
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Old 28-10-2014, 11:50 PM   #8
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Even torque is as important as tightness; I use a torque wrench on my wheel bolts. I would never rely on a tyre place to do it properly, they usually rattle them on at ridiculous torque.
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Old 29-10-2014, 12:41 PM   #9
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I checked the bolts and they all seems reasonably hand torqued so were certainly not too tight. I loosened the nuts and re-tightened them evenly and the issue persisted.

Although, it felt slightly intermittent at low speed and stronger at a higher.

I didnt jack the car up so wondering if having the wheels off the ground and perhaps putting them on and off would make any difference . I will also try swap them with my spare and see if the issue is with the wheel.
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Old 29-10-2014, 12:50 PM   #10
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Quote:
Originally Posted by Kryten View Post
Even torque is as important as tightness; I use a torque wrench on my wheel bolts. I would never rely on a tyre place to do it properly, they usually rattle them on at ridiculous torque.
And over stress the bolts/studs in the process. Having had a stud fail that eventually caused the whole wheel to shear off with potentially fatal consequences (the wheel hit the top of a flyover parapet before bouncing back!! A 30ft drop onto the Coventry inner ringroad would have killed someone) all the engineers that looked at the studs were convinced over tightening was the problem. My Merc's extended M12 bolts were rattled on with a gun so tight that the bolts could be seen twisting with the torque to undo them. Our Octavia went in for a service and came back with the rear bolts torqued up to 230 - 250ftlbs when they should have been 85ftlbs i.e. 3x the required torque! I insisted on new bolts including a full set of security bolts.

Have you noticed that Ed, the lanky moron in Wheeler Dealers always puts wheels on with a rattle gun, when he makes a BIG play about using a torque wrench elsewhere? For me he lost all credibility when I saw him put the first wheel on.
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