Has anyone used this kit:
https://www.ebay.com/itm/27704813361...Cclp%3A2332490
It looks very similar to the kits listed at speedway motors. All of these kits are imported, just looking for anyone that has actually used one or something similar.

 

For starters I would not use a 9" brake booster if possible. All 1967-72 Olds A-body cars with power brakes used an 11" booster. The 11" booster has 50% more diaphragm area than a 9" and thus produces 50% more pressure in the brake lines for the same pedal pressure. I would also not use drilled rotors on the street. You'll never feel a difference over stock rotors and the holes can be initiating points for cracks. Stock disc brake master cylinder with the 11" booster was 1.125" bore, not 1". Maybe this is an attempt to make up for the weak brake booster. The smaller M/C bore will require more pedal travel, which may or may not be a problem with the power brake lever arm location on the pedal (vs the non-power location that provides more throw). Once again the aftermarket kits are poorly engineered.

 

FWIW, a *dual* 9" is very comparable to a single 11" booster. Smaller diameter so easier to work around, but it's longer. A dual 8" is NOT, sadly. Most of the time there's really no issue using an 11" booster and they can be purchased from lots of vendors easily.
That looks like a pretty generic kit. Lots of similar kits available from lots of vendors. They should work fine, but as Joe noted, better to get one with a stock size booster and MC. That price does seem quite cheap.

 

Except that the booster in the kit is a single diaphragm 9".

 

Thanks very much for the great information. A cheap price is great, but not having the correct sized parts would not be worth it to me.

 

Hence the emphasis.

 

My ragtop came factory-equipped with 4-wheel power drums so a FDB upgrade was first on my list when I got the car in 2016 - at the time I scored a great deal on a Stainless Steel Brakes (SSB) A-body kit (not including booster) - I didn't like their rotors, brake shoes or calipers, so I sold them locally and went with independent upgrade level parts for those items.

 

Also as far as brake boosters go, Napa remanufactured Delco boosters are actually new Chinese reproductions - i.e. the same you get from innumerable aftermarket vendors - BUT Napa units come with a lifetime warranty vs. 90-days to 12 mos that I presume the aftermarket provides.

So if you elect to go that route and don't mind the black (vs anodized gold) finish they come in, great deal for the $$.

 

If you take your time and keep an eye on places like FB Marketplace you can usually find a factory disc brake set for less than $300. For that price you usually need to replace the calipers, brake lines, rotors, and the master cylinder but it's still getting you a factory brake set up and you want to buy the rest of that stuff new anyway. Brake parts like that are still carried dirt cheap at places like Rock Auto