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Pontiac Forum: 2004 Grand Am rear wheel cylinder replacement
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Old October 6th, 2018, 10:58 AM
HerronScott HerronScott is offline
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2004 Grand Am rear wheel cylinder replacement

I tried searching for my "issue" here but didn't have any luck so thought I would post in case it helped someone else.

My son's girlfriend's 2004 Grand Am failed inspection due to a leaking rear wheel cylinder and tie rod ends and I'm their go to person for basic car repairs (trying to get my son some experience here but they are in an apartment so more difficult than in a garage with tools, etc).

Tie rod end replacements went well, but I wasn't really looking forward to having to deal with drum brakes again (all our cars have disc brakes all the way around). After I got the brake drum off, the good news was that it looked like I could take the wheel cylinder off without removing any of the rest of the brake assembly just by taking the top spring off and slightly pulling the brake shoes apart on either side of it.

So I pulled the bolt for the brake hose and then started to look at the 2 bolts holding the wheel cylinder to the backing plate and found they are some kind of funky reverse torx head bolt. That's when, I came here searching for size and what tool you would need to get them off and wasn't able to find the answer (maybe my search terms were poor!). I finally found a few references to this needing an E8 wrench (there are E8 sockets as well but I don't think you could get one on them with the vertical link in the way without rotating the backing plate some how). Unfortunately, there weren't any stores locally that carried an E8 wrench that I could get that evening. I also found one reference that said a 1/4" wrench would work and sure enough the closed end of my 1/4" wrench fit perfectly and I was able to get both bolts out. The rest of the replacement went well and I repeated the same on the other side (the brake drum was *very* difficult to get off that side but it finally relented with lots of big hammer pounding on the rear edges alternating sides).

Scott
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Old October 6th, 2018, 03:53 PM
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melsg5 melsg5 is offline
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thanks for the post, I'm sure it will help others.
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