Going to replace my Brake Master Cylinder and it appears the O-Ring that is supposed to be replaced is now obsolete. No one seems to have one, although I haven't contacted the dealer's parts dept. Any thoughts or cross reference info for this part? Even if I were to simply rebuild the seals in the MC, I would still like to replace this O-Ring. Maybe my idea of keeping this car for 20yrs is wishful thinking. Any suggestions would be most appreciated. Just replaced the entire front brake components from Rock Auto. Had a shop check the drums and bleed the entire system again. Brakes work but I sense the pedal is traveling too far down. The brake pedal on this car has always felt a touch soft from new.

 

These two grommets for the reservoir come with the replacement reservoir, I’ve never seen them separate, so perhaps a new reservoir is in order

https://www.rockauto.com/en/catalog/...eservoir,13261

Don’t forget their discount code!

https://www.chevyhhr.net/forums/supp...-2020-a-61707/


That being said , Dorman might have grommets for that application at your local parts palace.

 

It appears that the master cylinder comes with a new reservoir. In this link, the picture of the Raybestos shows the O-ring included.

https://www.rockauto.com/en/catalog/...eservoir,13261

 

I see Cardone and the AC Delco one I posted, and the AC Delco for the manual transmission models.

 

You're looking at reservoirs, he says he's replacing the master.

 

I was referring to your post RJ

 

Hmmm... Their site is weird. Seems whatever page you very first land on, that is the URL that gets copied (and pasted).

I don't know how to work around it. You'll just have to select "master cylinder" instead of "master cylinder reservoir". Then you'll see them.

 

I looked that up for the grommets, here’s the master cylinders

https://www.rockauto.com/en/catalog/...+cylinder,1836

 

Thanks for your replies. I purchased a new MC with Reservoir from Tasca Parts. Haven't received yet. I'm not referring to the seals between the reservoir and mc but the single larger O-ring that goes on the sleeve of the mc. The part # is 22729482. It's listed everywhere but no longer available. I will try to see if the dealer has it. Don't think the new master comes with it. RJ, I see in the Raybestos pic the O-Ring seems to be present. In the AC Delco pic, there is no O-ring shown. I ordered an AC Delco. Maybe I should have ordered the Raybestos. I ordered the O-ring from a seller on Amazon which said they had it, but then they cancelled the order. Go figure. I just might have to reuse the original ring with some silicone grease. Not sure what it's isolating, Maybe vacuum from the booster. Thanks again, all.

 

Yes, I think OP is asking about the O-ring between the master and the booster.