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jl-c
Monza


Joined: 22 Jul 2013
Posts: 160
Location: Shropshire


PostPosted: Fri Jul 19, 2019 6:48 pm    Post subject: Running car on ramp at full droop. Reply with quote

As title, I want to run the car with rear wheels off at full droop so I can see if there is any run out on the rear discs. Is this possible without doing any damage? Other option is to revolve them by hand using a dial gauge, but that means I have to buy one!
Guess this could be a deMort question Very Happy ?
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Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.


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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Fri Jul 19, 2019 7:03 pm    Post subject: Reply with quote

I would be using a dial gauge ..

You can run up a car on the ramp but it may well get upset .. rear wheels spinning but not fronts ( unless a C4 ) .. car might want to activate abs .

you will struggle to measure .. well see a movement that would indicate a disc fault as well .

It can be done .. but the benefits and if it will help .. hmm .. not so sure there .

Rule of thumb ..

Front discs " warped " brake pedal will move under braking .. you feel it going up and down and the steering will shake .

Rear discs and just the pedal will go up and down .

It's only slightly and normally worse when hot .. ie you hold the brake / acc pedal for a bit to get some heat in them .. DON'T go mad here though .

First check .. and i talk from experience here .. make sure the wheel bolts are tight .. they give the same fault as a " warped " brake disc .. just a lot more dangerous !!!

btw .. any obvious pad rust marks on the discs .. ie where the pad was wet and left overnight so it rusts to the discs are often a sign that there is a high spot and will cause judder .

Also a second test without equipment ( i'm thinking as i'm typing here Very Happy ) wheel off and jacked up .. turn the disc by hand .. any time it binds / sticks in a certain place would also indicate a high spot .. high being out of true .
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jl-c
Monza


Joined: 22 Jul 2013
Posts: 160
Location: Shropshire


PostPosted: Fri Jul 19, 2019 7:08 pm    Post subject: Reply with quote

thank you deMort, as usual good thought out advice. It is a C2S and wheel bolts torqued correctly, thanks for the thought though!
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Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.


We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Fri Jul 19, 2019 7:36 pm    Post subject: Reply with quote

lets just say i had a lucky escape with a car .. brake vibration got worse on a r/t .. something didn't feel right so i cut it short and headed back to the garage ..

Rear wheels were not done up .. worrying for me and the customer !

Try what i suggested .. you don't always need expensive equipment .. some things like a rust deposit and a pedal judder are kinda obvious as to what the fault is Smile
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