Sonnax says: The pressure modulator valve controls accumulator back-pressure, relative to load and boost pressure. Bore wear will not allow a rise in accumulator pressure. Slippage and clutch failure are the result of poor line rise.
Restore roundness, concentricity and finish by oversizing the bore, then finish the restoration by installing this Sonnax oversized pressure modulator valve kit.
For further information and installation see Sonnax Product Info and Sonnax Instruction Data Sheets on our webpage www.newco-autoline.de or on Sonnax webpage www.sonnax.com - all information of third parties is beyond our responisbility