fbekholden.com

running a 186 trimatic with hr front discs. ive noticed when its cold on heavy braking the motor wants to stall. i assume its the vacumn from the vh44 booster. a common problem i suppost. are there any tried and trusted solutions that someones using at the moment . any info would help.

A hole in the booster rubber? My guess!

apart from pulling it apart is there any way of testing for this

Dave,

Test 1: With the car sitting in the driveway at idle, put your foot on the brake. If the diaphragm is shot (or valves passing) the idle will change.
Test 2: Disconnect the vacuum hose to the booster, push a drift up the rubber hose and hose clamp it. Go for a drive and see if the problem goes away (note that your brakes will require a little extra pedal effort when unboosted - go careful).

Don't ask me how I know the above tests work on a VH24..... sodding booster on the FB was only reco'd 2 years ago .

Cheers,
Harv.