Hydro not locking wheels

So a few things come to mind.

Firstly, although you've used a whole bottle of dot 4 - have you made sure to get all the air out of the system? Any air in the lines, will significantly decrease performance.

Secondly, what size is the master cylinder on the hydro? The calipers you are running sound pretty big, so the size of the master cylinder that your hydro is running might not be ideal for your calipers. This could be causing hesitation in your wheels locking up - so that could be changed.

Finally, although it seems obvious - make sure you're pulling that hydro as quick as possible and provoking the car enough to cause it to slip. If you're travelling at a slow speed in a straight line, and slowly pulling the hydro, it will almost act like normal brakes. Try driving with a bit of speed, turn a direction, and pull the hydro as sharp as possible.

Hope some of this helps.

 

It's hard diagnosing over the internet, especially without knowing the details of things. Some pictures of your set up would help. Like the hydro, the calipers, and maybe the lines running from the hydro to the calipers.

Since you're running dual calipers, it does make troubleshooting much easier tho. The set up for dual should be very simple. It should just be one line running from the hydro to a t-piece, with each branch from the t-piece running to each caliper. The hydro should have some sort of reservoir attached to it?? (either moulded part of the cylinder, or a screw on).

Chris fix does a great video on how to instal one properly, would recommend watching ->

Sorry if you've literally done all of this, but at this stage, I'm just guessing. I still think it's either a cylinder size problem, or you're just not giving it enough welly to get the rear end to lock up. But it could also be that you're car is very gripped up, or you've done you're lines wrong somewhere.

The possibilities are kind of endless. I think the best strategy is to make sure that all the installation components are done correctly. Then move on to correct parts. Then correct usage.

 

That master cylinder is too big.
Try a 0.625

 

I've got exactly the same issue with the chasebays hydro

 

@Jimbaw - What size is your cylinder?

 

Same as OP. It's the one that comes with the chasebays kit (.75)
I've got twin 350z brembos in the rear

 

Oh hang on, l must apologise for not saying what you want to hear.
I'll start over.
Your master cylinder is perfect, the calipers are perfect as are the pads and discs.
You just need to bleed it better!
Keep bleeding it.
And when you get bored bleeding the brakes... read this:
https://axleaddict.com/auto-repair/DIY-Auto-Service-Hydraulic-Brake-System-Operation

 

Der....
its bigga it must be betta.

 

Given that the Chase Bays handbrake has no provision to change the pivot points you are fucked unless you fit a smaller master cylinder or calipers with bigger pistons.
Given that you appear to be ignorant, l'd say yer fucked.

 

Who are you arguing with??

 

Not you.

 

I guess you mean me?
l'll explain.
Someone asks for help from people with experience, generally speaking this kind of help costs money.
The answer is obvious to the experienced and they offer the information for free hoping it will help.
The person completely ignores the answer for whatever reason and does not even acknowledge with a reply, presumably because they don't want to hear the answer.
Sorry if my response seems weird, it is probably borne out of frustration.....

 

Good call thanks.
I'll not bother in the future.