stingraynick75

I recently had an alignment done on my 2017 GS. They did not adjust the rear caster as they did not have the tool. I did notice after I got home that the left rear tire was @ 37 psi and the other 3 were @ 27. Will the differant tire pressures cause a mis-alignment?

C7 Apex

They won’t change the alignment specs on the sheet, but it will make the car handle a little weird. You should set them correctly.

Flattman

Was the tire pressure that way before you left for the alignment?

wrecker3

When i do a wheel Alignment the first thing i do is set the Tire Pressure to the Factory setting sticker !!!

stingraynick75

it was like that when he worked on it, it was equal before i took it in.

RacerRik

Alignment is measured with the weight on the wheels / tires. With a 10 psi difference, that will affect the sidewall height of the tire and thus impart some error into the alignment measurements. And you always need to set rear caster when you do an alignment on a C7.

wrecker3

Alignment Machines Cannot Measure or Display Rear Caster. That is why this Tool is needed.