Thanks Ron, that explains why some booster didn't come with the big spring. I've sourced one from a garage and will install it.You are right; the brake booster never originally came with a second coil spring beneath the air control housing. Later, a modification spring was installed as it was found that the brakes could remain on, particularly after light brake applications. The inclusion of the modification spring eliminated the problem. The springs could be purchased a few years ago, I recall.
Ron.
Thanks Ron. I thought that maybe changing the position of the rubber seal, could help the piston not to stick in the bore.Hi Carlos,
Photo 1 illustrates the correct orientation for the rubber seal.
Ron
Thanks Cobraboy.Comparing those two seals is akin to comparing apples and oranges.
The first is a single lip seal, the wide end must always face the brake fluid. The second looks like a double lip seal, this has the potential to be fitted either way round. I do not beieve the piston groove choice is important.