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The bomb is down in the space behind the rad fan Karl. Just have a look down there, you'll see it.
PAS fluid with regards to the bomb, no brake fluid involved directly with it.
Jase..
2001 Avus Silver B5 RS4.
2004 A4 Avant 1.8T quattro Sport-LE.
1995 S2 Coupe - sold (sniff)
Cheers matey. So how does it work and connect to the brakes then?
Cheers
Karl
Oz (in the engine bay now scratching my head )
Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
Audi 90 Quattro 20V 1989 7A
Audi TTRS 2010 APR stage 2 +
Triumph 675 Street Triple R
I don't pretend to understand it fully, but the bomb provides pressure to the servo with hydraulic fluid. You have a feed and return line from the servo.
When replacing the bomb, no bleeding of the brake fluid is needed as the accumulators circuit isn't directly connected to it.
I've only observed one being changed, well, I got roped in to a certain degree, but not actually changed one solely on my own.
Jase..
2001 Avus Silver B5 RS4.
2004 A4 Avant 1.8T quattro Sport-LE.
1995 S2 Coupe - sold (sniff)
Karl the bomb sits on the high pressure line from the PAS pump to the brake servo and effectively "pushes back" against the pressure of the hydraulic circuit.
Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
Audi 90 Quattro 20V 1989 7A
Audi TTRS 2010 APR stage 2 +
Triumph 675 Street Triple R
I don't pretend to understand it fully, but the bomb provides pressure to the servo with hydraulic fluid. You have a feed and return line from the servo.
When replacing the bomb, no bleeding of the brake fluid is needed as the accumulators circuit isn't directly connected to it.
I've only observed one being changed, well, I got roped in to a certain degree, but not actually changed one solely on my own.
Jase..
It's really easy to change with the rad out, with the rad in the car access would be from underneath for a few bolts.
IIRC there are two types, one has a round top on the housing, the other type has a square top... round top is the earlier type, square one is later type
AFAIK its just the size of the banjo fitting thats different - if you're going from one type to the other for whatever reason, you'll need to change the hydraulic hose from the pump too - BTDT
I'm going to be doing this job on my 2.6 4b this weekend as my brakes have been piss poor for ages now. after new rear calipers, refurbed some 2.8 fronts, discs allround, new fluid and flexis. The bomb is the only thing I can think of changing now as the "!" Light stayes on for ages on start up. Is there anything special I need to do when fitting the new bomb? Or is it just bolt off bolt on? Any bleeding of the hydraulic or brake fluid needed? Also I'm in the market for some new pads, any recommendations?
no bleeding required, the system is self bleeding, although it is a good time to flush and renew the hydraulic fluid. Once you've fitted the new bomb and topped up the fluid run the engine and turn the steering lock to lock a few times, this will bleed out any air bubbles.
I'd drain the fluid first or you will end up with G002000 all over you, the car and your driveway / garage once you crack the fittings off the bomb - its the lowest point in the system The rubber mounts for the bomb bracket will probably want replacing they normally disintegrate when you try to remove them.
for this warning sign in the morning, while the brakes working adequately, i would first do another much cheaper thing. The 2 bolts that bolt the high pressure hose going from the pump to the bomb, both have very tiny orifices and some meshes. Try removing them and cleaning them up before going for another bomb. It may elminate the morning warning sign and keep the bomb for good while longer.
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