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soft/low brake pedal

Vin999

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It defeats the whole purpose of the upgrade. This upgrade is primarily about improving the master cylinder which exerts the force. VS booster is just a better booster than the prior models and bolts straight in.

The caliper upgrade is nice but not mandatory, this mod predominantly leaves you with more pedal force and better modulation on single pot pinchers.

That sucks about the master mate. In 6 upgrades I've never experienced that, I swear normally this upgrade is a piece of piss with many rewards. Is it possible that master was sitting around empty for a long period?
Not putting on the 2 piston callipers isn’t really a doing a full upgrade conversion to improve to better brakes over just the VR single piston callipers.The standard VS 1” m/c with VS booster was factory adequate for the single piston calliper if all the parts were ok and done and bled properly.

The whole point of using VT/VX m/c was its big bore bigger than 1" fast fill option for the larger pad/disk rotor area which gives much bigger better brakes, that is why it’s done in the first place over the less brakes of the VS booster with VX m/c and just single piston callipers.

Yes pressure will feel to be better with what you’re saying but brake capabilities still the same, it’s all about more bigger flow and bigger brakes/pad surface area. 4 piston callipers stop better than 2 piston anyday. :)

Its the same debate with high pressure oil pump over hi volume oil pumps or with fuel lines/pumps in size and pressure. Bigger volume/size is always better than pressure.

The OP issues are rising from old parts wrecker parts that are suspect over buying new and he is mixing matching things he doesn’t know about and getting the issues he has posted since 2016 for a long time. He seems to enjoy just playing around with a serious subject like brakes just to experiment and continuous posts.
 

pete30nz

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It defeats the whole purpose of the upgrade. This upgrade is primarily about improving the master cylinder which exerts the force. VS booster is just a better booster than the prior models and bolts straight in.

The caliper upgrade is nice but not mandatory, this mod predominantly leaves you with more pedal force and better modulation on single pot pinchers.

That sucks about the master mate. In 6 upgrades I've never experienced that, I swear normally this upgrade is a piece of piss with many rewards. Is it possible that master was sitting around empty for a long period?
Morning,

Yes it's possible it was sitting around for a while.
This week's been busy, but will get onto rekitting the master a.s.a.p

Cheers
Pete
 

Pollushon

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I'm not debating anything Vin999 it's just fact. A longer handle on a breaker bar will yield more torque with the same socket. That's physics, not an opinion.

As for your oil pump simile, it's dependant on the engine.

You really love to try stirring things up with your matter 'o fact opinions don't you?
 

Vin999

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I'm not debating anything Vin999 it's just fact. A longer handle on a breaker bar will yield more torque with the same socket. That's physics, not an opinion.

As for your oil pump simile, it's dependant on the engine.

You really love to try stirring things up with your matter 'o fact opinions don't you?
No issues here you’re implying, just replied to your point @ It defeats the whole purpose of the upgrade.
As for opinions, I have the VT/VX full brake disk upgrade we are talking about with factory 15” alloy wheels with V8, and absolutely day and night compared to just a part booster/master cylinder change part upgrade with single piston callipers without even mentioning brake fade/heat issues/load/high speed or multiple heavy braking use.

About your unrelated physics force fact, which car would pull you up safer in an emergency at the bottom of a hill, the VR/VS single m/c upgrade with single piston caliper or the VT full upgrade 2 piston calliper and that is just for a standard 6 cylinder factory car ????.

Its your choice, your safety what you think works for you or what OP Pete wants to use in his never ending brake story. He asked about not knowing and wanting/doing a brake upgrade and I posted about the proper full upgrade, again what he does/uses is his choice.
 

pete30nz

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Hi guys,

This is what I've found when removing the master, as in a leak of brake fluid -photos below.
When I ran my finger around the inside rim of the booster lip there was only a tiny bit of wetness.
The booster mating surface of the master cylinder wasn't that moist at all.

Any way I'll continue to install the new seals for the master cylinder.

Cheers
Pete
 

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pete30nz

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Evening fellors,

New seals installed in the 1 inch VX master,
Also the resivoir gromet seals to.

The ADR o ring kit, unsure what that's for?
I'm guessing it's the valve type thing sitting right beside the fluid flare nuts.

Other than that, it's good to install.

Cheers
Pete
 

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vc commodore

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At least you have found the source of your soft brake pedal.....That's half the battle...The other half you're on top of, which is terrific
 

pete30nz

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Hey guys,

Still air in the system I guess.
Have tried key in on position while bleeding.
Havn't tried engine running while bleeding yet.

Still haven't received my vacuum bleeder, wish that would hurry and arrive.

Cheers
Pete
 

VPRob

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I don't have ABS. I just did a gravity bleed. Tubes on bleeder nipples, jars underneath, cracked bleeder nipples, watched MC reservoir and checked tubes for bubbles.
 
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