when i start car up abs warning light and brake warning lights are on , and pedal hardly moves , massive effort to get car slowed down . however enroute to garage to get it checked i had only driven 100yards and lights went out and brakes worked perfect , then arrived at garage said that car was ok , had a bit chat with the lads until closing up for the day , started car and problems back . now when stopping and idling for maybe 20 secs lights come etc . what the f**K?? any body got any suggestions?
the chaps at garage checked the connections with multimeter at the 3 plugs around master cylinder area , they were all getting power etc even when fault still there.
( i should add that the cars been off road for winter for 4 months)