PDF associated:
/PT 52-0002.pdf
JDA5235 PT 52 0002 Hydro Boost Flush Procedure Vehicles with power steering pump powered hydroboost brake systems Pedal kickback grabbing brakes increased pedal effort hissing noise while applying brakes or increased steering effort Possible contamination of hydroboost system due to deteriorating hoses contaminated fluid or steering unit failure It may be possible to restore proper operation by flushing the system using the following procedure An in line filter CARDONE part 20 FLT1 or 20 FLT2 MUST be used during the cleaning cycle see Note below After cleaning if the filter and fluid show obvious signs of hose contamination all hoses must be replaced and both fluid and the in line filter changed again 1 Chock and hold vehicle with hand brake 2 Check power steering pump fluid level fill as necessary do not over fill 3 Start engine let idle and allow to reach operating temperature 4 Raise idle to 2200 rpm and maintain throughout test 5 Pump brake pedal firmly 25 times 6 Turn steering wheel lock to lock 5 times 7 Hold at 2200 rpm for 15 seconds then allow engine to return to idle 8 At idle turn steering wheel lock to lock 3 times without applying brakes If hard effort or binding is noticed repeat steps 3 thru 6 once If proper operation is not restored go to step 10 Complete steps 10 thru 12 perform necessary repairs and repeat from step 1 9 Test brakes for proper operation before moving vehicle then drive vehicle 5 to 10 mph Apply brakes to full stop verifying booster operation and steering action 10 If brakes do not grab and steering effort is normal shut off engine allow system to cool then inspect in line filter If hose debris or contamination is found hoses and fluid should be replaced and test repeated 11 If grabbing is felt pedal is hard or pedal stays down check power steering pump before replacing the booster 12 If steering effort is effected power steering pump and steering unit tests must be performed see Pro Techs PT 20 0003 20 0004 20 0005 20 0008 20 0012 20 0016 20 0018 52 0001 When installing the filter refer to instructions on the back of the package for proper installation Problem Application Service Procedure Cause Solution Note
