I just got my booster back from Karps Power Brake Service, and it looks great, but it came back without the mounting hardware. Off to the store for 4 3/8-24 nuts, but should I be getting flat or lock washers?
Mastercylinder to booster. Split washer. 20250426_185500.jpg
I wasn't specific enough, I'm looking for what goes behind the firewall and holds the booster to the firewall.
Thanks,
Del
I cannot remember if these are the same nuts that hold the entire brake pedal assembly to the firewall. That is packed away. I might be able to get a glimps in my parts car. But the inside is trashed right now.
Later I think it was common to use the type where the toothed washer is part of the nut. Not sure if those had a name, I suspect the name depended on the brand.
The booster came back with 1 of the 4 nuts on it and it was a normal nut, but it could have been whatever the rebuilding had lying on the bench to make sure the threads were clean after the plating.
I see no washers on the inside.
20250428_180446.jpg20250428_180940.jpg20250428_180953.jpg
Looks like what I always heard called a 'Stover locknut'. I would guess thats a brand name, not sure if they are still around or not.
Stover nuts can still be found. Just not everywhere. Uses a deformation in the thread to lock in place.
20250428_185229.jpg
Stover lock nut no washer it is, thanks for the help!
Given the location and visibility of the nuts, and availability considerations, I may settle for a nylock nut.
Del,
Here is a close-up of the interior nuts and toothed washer used in a 59.
Hope this helps. (expand the picture to see the teeth more clearly, but they are there)
Have fun,
Steve B.
Quote from: TJ Hopland on April 28, 2025, 10:56:16 AMLater I think it was common to use the type where the toothed washer is part of the nut. Not sure if those had a name, I suspect the name depended on the brand.
They do have a name, they are called KEP nuts, you can Google that name on the internet and get a large variety of same. FWIW, if that were my booster, I would use flat washers and nylock nuts. Not a big deal unless it is a show car and you think the judges will look under the dash to see what kind of fasteners you used. :)
Quote from: TJ Hopland on April 28, 2025, 10:56:16 AMLater I think it was common to use the type where the toothed washer is part of the nut. Not sure if those had a name, I suspect the name depended on the brand.
Flange or flanged nut.
tony
Thanks all, not a show car so not worried about a judge sticking his head under the dash, just wanted to make sure I attached it appropriately. So it looks like locking nuts are the theme, with a preference for KEP or Stover. I do have a latent AR tendency that wants to get things as close to authentic as possible even if it's not a show car.
Del,
The toothed washer is OEM - and cheaper, but who am I to get involved in such a life changing, earth shaking decision.
Have fun,
Steve B.
Cheaper and more accurate! How often does that happen in this hobby? Must be my lucky day.