Removing abs unit for track day use

[alex new]

Hello,

I want to remove the abs unit for lightening purposes and better feeling for track use.
The car is a vectra a / vauxhall cavalier mk3 with a 22mm master cylinder.

Can this master cylinder can work without the abs unit?
Also what I need for the rear brake bias?

Do I need a adlustable valve like this willwood Professional Motorsport Parts, Spares & Rally Equipment from Rally Design or I can keep the std reduce valves on the rear beam?

Thanks

[dewismotorsport]

The master cylinder will still work but you will need to re make pipes for rears to run one single pipe to rear then put a bias valve in the car for better adjustment of the rear, the fronts will need to have the unions joined together or make new lines for front as well

[alex new]

thanks for your reply. do you know how much is the weight reduction of removal of Abs union?
The unit is from Bosch in a vectra a /cavalier mk3 93 facelift 1.6

[Davebgsi]

u could just pull the fuse out on track days?

[alex new]

u could just pull the fuse out on track days?

Yes, it's a solution.

But I think because the brake circuit passes from abs unit again and the feeling in braking it's not the same as a circuit that don't passes from abs unit.

Also when I disconnect the abs fuse I feel that the braking in rear is more than optimal propably because the car is lowered and gives a oversteering feeling in braking before turns.

And last if I remove the abs unit probably I will save 8-10kg of weight in front of the car.

But as you said it can be done also with this way. Better is to try how I like more the car in track. With abs system or without it.

[vectra640]

How about fitting some bypass valves?

[alex new]

you mean something like that?

Professional Motorsport Parts, Spares & Rally Equipment from Rally Design

[vectra640]

yes pretty much, saves ripping the abs unit out every time you track it, just the expense of the valves and the aggro of fitting them

[vectra640]

unless there is a cheaper alternative

[alex new]

I think that if I want to keep the abs unit, I need two bypass valves like this one. Because the std brake circuit have two channels, one for front left with rear right wheel and a second for the front right with rea left wheel. So if I want to restrict a bit the rear wheels braking I need two bypass valves to make the job and keeping the abs unit.

I will decide when I will drive the car in track to see what will be preffered.
Thanks