Servo vs booster

NigelProdrive

Daily Driver
No front to rear bias valve ever came in Scorpions. Series2 Montecarlo perhaps.

If there was a magical front rear Lancia bias valve, still the better option is an adjustable proportioning valve from Wilwood and mounted in reach of driver. Every car is different even between same models; from gross weight, weight ratio, tire compound, variable air pressures,.....and then driving on different surfaces, road temperatures and weather conditions. It'd be like doing all the work installing AC in your car with only one temp setting versus being able to blow between cool and ice cold.
 
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kmead

Glutton for punishment
Are you getting a logon screen? I set up the website and it’s just a simple site, I hope

As I have never attended one of your events I am not a member :)

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lanciahf

True Classic
Okay thanks for that, something is up. I contacted the hosting company. I'll let you know when its back up.
 

kmead

Glutton for punishment
Parts manuals are always nice things to have given they show the relationship of parts, part numbers and clues to how things really work.

Below is the S1 Monte Carlo braking system for the front showing the two output MC master cylinder with a single line going back to the servo, a return line and then the splitter to each front caliper.

E8261562-7360-47EF-805A-8EDD6F2EDD7E.png


This next image shows the rear circuit with an inset of a detail for the American market Scorpion front brake system which adds the brake failure warning switch 4354561 with a splitter to the rear brakes with lines to the individual calipers, one from the splitter and the other from the pressure switch.

B527AE62-6DCF-4285-9447-5144B16EACC1.png


As shown in this image which unfortunately intermingles the clutch lines:

EEBD4C15-5DF1-404D-B0BB-0B30DC896491.gif


The Series 2 Monte Carlo brake system is simpler still but does add a pressure limiting device for the rear calipers only and is part number 4469037 referred to as a brake balancer on various websites. I have not found one online but somewhere I am sure there is one…

2852C87A-4BBE-4081-9BC1-8FFC5902A07D.png


Lastly a close up of the unit

611029CF-720E-438C-8AD2-E60FA4363AB4.png


From this one may conclude Lancia went to a system which still ensures the fronts still lock first and relies on the human being acting as the ABS system by modulating the braking based on feedback from the system.

When I do end up with a Scorpion someday, I would be likely to use the parts Monte Hospital offers to get rid of the front splitter (this allows using the standard X1/9 3 port master cylinder), upgrade the brakes to as similar to S2 specification in regards to disks and then put an inline adjustable Wilwood proportioning valve in the rear circuit to match what Lancia did on the S2 cars.

Karl
 
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lanciahf

True Classic
My old brake setup. I shipped a front hub and rotor to Todd at TCE Brakes and he took care of the rest. Scott Hayes another Scorpion nut recommended him.
Pedal Assembly with TMH modifications
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1637861540416.png

1637861506912.png
 

ward00

Daily Driver
Parts manuals are always nice things to have given they show the relationship of parts, part numbers and clues to how things really work.

Below is the S1 Monte Carlo braking system for the front showing the two output MC master cylinder with a single line going back to the servo, a return line and then the splitter to each front caliper.

View attachment 55320

This next image shows the rear circuit with an inset of a detail for the American market Scorpion front brake system which adds the brake failure warning switch 4354561 with a splitter to the rear brakes with lines to the individual calipers, one from the splitter and the other from the pressure switch.

View attachment 55319

As shown in this image which unfortunately intermingles the clutch lines:

View attachment 55322

The Series 2 Monte Carlo brake system is simpler still but does add a pressure limiting device for the rear calipers only and is part number 4469037 referred to as a brake balancer on various websites. I have not found one online but somewhere I am sure there is one…

View attachment 55318

Lastly a close up of the unit

View attachment 55321

From this one may conclude Lancia went to a system which still ensures the fronts still lock first and relies on the human being acting as the ABS system by modulating the braking based on feedback from the system.

When I do end up with a Scorpion someday, I would be likely to use the parts Monte Hospital offers to get rid of the front splitter (this allows using the standard X1/9 3 port master cylinder), upgrade the brakes to as similar to S2 specification in regards to disks and then put an inline adjustable Wilwood proportioning valve in the rear circuit to match what Lancia did on the S2 cars.

Karl
Looks like this place may have them http://lancia.cc/article/Montecarlo/Montecarlo+S2/Brakes/4469037.html or not based on what "unrecoverable" means
 
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