Club 80-90 Forums

hi all how do i check for air leaks on the servo pipe that fits onto inlet manafold ??

Hello,

Servo flexy pipe....

From the inlet manifold through the (probably gungy brown and brittle) plastic pipe to the one way valve (2 colour plastic)..

If all is well the brakes should be solid feeling when on, with not much pedal travel..

Try this test.. on the flat in neutral.. handbrake off.. engine on.. brakes on.. switch off engine..

If after 3 or so seconds you can feel the pedal pushing up for 3 or so seconds .. then all is well and the system is airtight..

Hope this helps..

Cordialement..

sarran1955 wrote:Hello,

Servo flexy pipe....

From the inlet manifold through the (probably gungy brown and brittle) plastic pipe to the one way valve (2 colour plastic)..

If all is well the brakes should be solid feeling when on, with not much pedal travel..

Try this test.. on the flat in neutral.. handbrake off.. engine on.. brakes on.. switch off engine..

If after 3 or so seconds you can feel the pedal pushing up for 3 or so seconds .. then all is well and the system is airtight..

Hope this helps..

Cordialement..

thank you im geeting thier cured air leaks on inlet manafold rubber joinings and a gasket thanks for servo hose leak test but better do it in daylight

Accepted standard test:

1) Engine off: pump the brake pedal several times until the pedal goes hard

2) Rest you foot on the brake pedal (medium to light pressure)

3) Start the engine and you should feel the brake pedal surge downwards/gaining a degree of spongyness (from rock hard to pliable) lol

However....NOTE* if the pedal WAS hard initially and didn't need pumping to become rigid (with the engine off) this indicates a vacuum leak whilst stood, as in, hole in the supply line, faulty one way valve or damaged servo itself.

Martin

test for leak
with engine running spray carb cleaner or similar onto the rbber hose, if revs increase it is leaking
usually shows as high hc when co bob on or low

I filled my servo hose with parafin.. it bled like a snake blasted with buck shot

thank guys for the pointers it looks like i have a fault so starting with a new non return valve £15 and a lenght of 13mm hose at manafold
end i will let you know how goes it got a new earth strap chassis to gearbox to fit old one is very crusty

SILVERFOX2013 wrote:thank guys for the pointers it looks like i have a fault so starting with a new non return valve £15 and a lenght of 13mm hose at manafold
end i will let you know how goes it got a new earth strap chassis to gearbox to fit old one is very crusty

Vacuum hose......otherwise it might collapse.

Martin

Yes.. PTFE pipe is good

ok iv got valve and 500mm 13hose coming from just campers hose was listed as servo hose hope it is

update fitted new hose&clamps new return valve i now have vacum asisted brakes & no leaks on intake manafold thanks for all help given