Pressure Accumulator Pressure Relief Valve, Checking
Test Prerequisites
- Supply quantity of hydraulic pump OK.
- Supply quantity under pressure min.
0.2 L/min (0.2 qt/min) at engine idle speed HYDRAULIC PUMP SUPPLY PRESSURE, CHECKING, 100 AND A6
Checking
-- Connect hose of tester Pressure Gauge:VAG1441 to hydraulic brake servo using banjo bolt and copper seals that come with tester.
-- Let engine idle until needle on gauge shows operating pressure over 140 bar (:2030 psi).
If this pressure is not reached, pressure relief valve is not OK.
-- Replace pressure accumulator.
-- Measure operating pressure again.
-- Reduce operating pressure by pumping brake pedal approx. 20 times with engine not running.
-- Remove tester Pressure Gauge:VAG1441 .
-- Install warning switch and check for leaks.
-- Check hydraulic fluid; top off if necessary.