pressure shake in reverse

[Momohenri]

hi all , i have a problem with my A4ld , i have rebuild the a4ld but in P,N,OD,D,2,1 the pressure is 55 psi at 800 rpm , that's right , in reverse at 800 rpm i have 110-120 psi an the acute shake , who have an idea ?

 

[Dirtman]

When it was rebuilt did they bother replacing the pump? Those pressures are crap....

 

[Momohenri]

the pump has been replaced, the pressure is bad only in reverse , I think it comes from the piston which is not well put in the band or the body valve