Dedicated DA9 Q & A thread

[hondapop]

Gidday Stevo, yes, the booster was my first thought (The M/cyl has been everyone else's. Even the brake guy was doubtful). I was getting vibration from the brakes under moderately hard braking (why I checked the pads).

Everyone I've asked about the booster has said when they go you get a hard pedal (loose boost). I had this sort of thing happen a long time ago and the effect was that when you pressed the pedal it actually pushed back at you. At that time the diagnosis was the booster (and correct). Unfortunately I don't like my chances of pulling up in a hurry with the way they are especially as the pedal doesn't "pump up" as it would if it was just a bit of trapped air.

[stevo716]

my whole system is brand new except the master and ive bled it alot
pretty sure boosters can die different ways
the obvious one is not working anymore not giving vacumm u get ur stiff pedal
i get same as u tho, with car off, the pedal feels perfect, i cant push in at all.
but once its on, (with extra then i wud normally brake with) i can push it all the way down

just had a quick google search u might find this interesting
http://www.youtube.com/watch?v=KIQIB...el_video_title

[hondapop]

I just had a look at that one stevo. I shall give it a go. Will try anything before attempting the struggle that it is to replace the booster (especially getting the pivot pin and split pin back in)

[menacer]

hey guys from a mechanical veiwpoint it really shouldnt be the booster... even if the internal valves fail it would not let the pedal travel much (if any) further. most probable causes would be master cylinder seals, old soft flexable hoses or as previously mentioned air in system.

[mooshie]

Maybe take the vaccum hose off the booster and see what happens. Should be really hard. If not then you know its something wrong with the fluid side of things.

[hondapop]

Gidday menacer and mooshie. Replaced the M/cyl yesterday (original had no leaks when I took it out)with a new one, and I have driven it with the booster working and with it blocked off with no change(brakes are working in both instances but very poorly). One of the members on CRXAus posted up some tests for the system from the W/shop manual which I will try today and I also saw on a UK forum (also referred) regarding the adjustment of the rear caliper piston (I may not have adjusted it up close enough to the pads when I installed them). Going to also check the hoses for expanding under booster pressure. So I'll let you know how I get on.

[menacer]

hmm. caliper piston adjustment is a possibility. however if its that then you should have no rear brakes untill approx 1/4 pedal travel... lines are still quite likely the problem.

[hondapop]

HOORAY for Youtube, your find stevo seems to have done the trick. After going over everything, doing the tests and checking the rear calipers (which were as tight as they could be) I took it out to a quiet spot and did what "eric the car guy" said and it seems to have worked. Is locking up the front wheels and the pedal feels firmer with less travel. Reading elsewhere this should improve, so fingers crossed.

[stevo716]

haha mad cool cool

[DA9teg]

http://www.youtube.com/watch?v=uvYE8...el_video_title
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[DA9-47]

Who's car that???^^^

[menacer]

original locations

hey guys puttin on my skunk2 manifold (ignore numbers in pic, i just reused da9-47's) n wondering about vacuum line for fuel pressure reg. on factory manifold it comes from back of manifold up to round black thing(servo of sum kind??) then to pressure reg.
on new manifold it appears it comes from front of manifold near pressure reg.
do i have to run line via 'round black thing' or can i bypass it n go straight from manifold to pressure reg???