Engineering tomorrow

[Modena]

twin masters with balance bar wouldn't have this problem

[boxhead]

You are right Modena, balance bar doesn't

[gjkrv8]

Originally Posted by Modena

twin masters with balance bar wouldn't have this problem

Engineer told this is ok as long as you cant adjust it from the drivers position. i.e. On your back with spanner is ok

Rgds

Gregg

[Merv and Sharon]

True as I understand but to get pads right is important first. With Commodore front and Nissan rear calipers and Falcon MC the combination can be tricky!

[byroncobra]

mmmmm I'll try the pads when they arrive on Monday....easiest n' cheapest option.
Let you know after a test drive.

[Zedn]

Originally Posted by Merv and Sharon

I am certainly no expert on brakes but I understand that increasing the braking at the front (via better calipers, softer/higher friction pads, and/or larger rotors) would increase the front/rear bias problem that you and most of us with Harrison's face. The fitting of higher friction pads at the rear helped a lot in my case for little cost (I got mine from Pedders), as they did for some others.

The key issue is the 'crack point", where the fronts are supposed to lock (on non-ABS systems) before the rears - just. You don't want the rear end coming around to meet you. For QT inspection they will (separately) test the rear braking on their roller. You need to have enough there to pass their test but not so much that they lock first.

See: http://autospeed.co.nz/cms/title_Bra...1/article.html

I believe that this is similar to the PBR MC that you will have:

My XF Master cylinder has 3 outputs. 2 on the front and one at the back where the plug on this pic is shown. Is this normal?

[boxhead]

From memory they have 3 ports going out.
Anyone correct me if I am wrong as I dont have a XF type cylinder, but this is the same housing as fitted to my Valiant Hearse and pipes are as I have labeled.

[Zedn]

Mines pretty much the same except it comes out of the plug instead of the side.

[boxhead]

Interesting Zedn, I have seen cylinders like that before, just cannot remember what they where fitted to.

[Merv and Sharon]

Yes Liam that is right and the same as mine as yours. I was saying, "this is similar to the PBR MC", for the illustration of the sequence of springs, pistons, o-rings, etc. in the MC. Can't seem to find an internal schematic that is exactly the XF anywhere. Do you have one?

[byroncobra]

Yes, 3 outlets as mine, it's the XF m/cylinder. Can't find a schematic either Merv

[LT65]

I have a Gregory's manual for the XF can't post scanned pages here due to size of file but can email them to who ever wants them. Split point for sedan is 2.4mPa and 3.1mPa for goon and commercial. Apparently the figures are stamped in the end if the mc.

Hope this helps

[LT65]

Just checked my car the mc a reco unit is not stamped but the leaky one I originally sourced from a wrecked panelvan is stamped 3.1 on the end where the front brake ports are. However I did notice the rear brake port plugs are a different anodised colour the panelvan mc is green and the one in the car which I am assuming is a seden mc due to braking performance is red. Maybe coincidence can't really know.Maybe a bit more of the puzzle.

Lionel.

[Merv and Sharon]

Thanks very much Lionel. That would be useful, as these are hard to get. My (generic) email is mervhyde@gmail.com


Cheers,

[Outwest34au]

I have an EF wagon and an EF sedan here, (I know that isn't XF) but they both have numbers stamped on the end plug of different values, the wagon also uses different ports to the sedan. Never noticed the piping difference till this topic evolved.

Lionel, if you'd like to email the scans to me at gary@comdotau.com I can host them on one of my sites and post the results here in jpg or pdf as the crowd prefers.

[Merv and Sharon]

Lionel has kindly supplied an XY schematic and the relevant manual pages for operation, disassembly and assembly:

[stumpeater]

Thanks Lionel & Merv for posting that schematic, very handy. I have one query, on the warning switch, there are 2 pins, I assumed they were opposite sides of the switch and hooked up one to earth and the other to the warning light, but it turns out it is actually an earthing switch, and the pins are joined inside the switch body, where does the second wire go to when used on the Falcon? I've got mine working by removing the earth wire.Thanks.

[WKB]

On my car there are no issues with the brakes. All the components of the brakes are either new or reconditioned. I checked my MC and it had 2.4 stamped on it.
Now can anyone explain why some cars have no brake issues and others have on identical setups.

Warren

[Merv and Sharon]

Woops! Typo above - NOT XY but XF (the one of interest). Will check the wiring later.

[boxhead]

Stumpeater, when you say "I have got it working by removing wire"
Are you saying that the dash light is on on your car until you remove the wire?
If so then I personally would say you have wired the switch correctly, and infact the switch has been tripped, to reset the switch, it is just a simple case of removing switch and pumping brake pedal a couple of times, then refitting switch.
No fluid should come out (if it does then there is a fault inside your master cylinder).

Forgive the rough diagram.

Originally Posted by stumpeater

Thanks Lionel & Merv for posting that schematic, very handy. I have one query, on the warning switch, there are 2 pins, I assumed they were opposite sides of the switch and hooked up one to earth and the other to the warning light, but it turns out it is actually an earthing switch, and the pins are joined inside the switch body, where does the second wire go to when used on the Falcon? I've got mine working by removing the earth wire.Thanks.