front rotor pads

[911tr8r]

My newly acquired S5 hates to stop. What jumps out at me is that there is not a speck of brake dust on my wheels. Does anyone have a good source for some soft brake pads?

 

[DanR]

I have a good suggestion for you to be able to stop much better, safer and surer.

Get the Rear Disc Brake Kit I offer for the Sunbeam Alpine and Tiger.

Click on the link below in my signature element

DanR

 

[Toyanvil]

Start with the basics, is the brake fluid new and bled, hoses, calipers and M/C in good shape. I have to clean my wheels every week or 120 miles. Rear disc will help once the front are working right.

 

[alpine_64]

I have a good suggestion for you to be able to stop much better, safer and surer.

Get the Rear Disc Brake Kit I offer for the Sunbeam Alpine and Tiger.

Click on the link below in my signature element

DanR

Dan, your kit is great from all accounts.. but sounds like he has some basic issues to deal with ...car sounds like it's not up to stock.. I'm thinking air in the system or something preventing full force of the calliper

 

[DanR]

Dan, your kit is great from all accounts.. but sounds like he has some basic issues to deal with ...car sounds like it's not up to stock.. I'm thinking air in the system or something preventing full force of the calliper

Michael, I don't disagree with you or your thinking.....such asa something preventing full force of the calipers..... pull them and send to Sunalp for rebuild.

 

[911tr8r]

All above has been done. Stainless hoses, brand new MC, pedal is rock hard and rear drums are adjusted one click from moving. So I suspect the pads.

 

[todd reid]

No mention of a servo. A stock Series V master cylinder with the servo removed is not going to stop like a modern car.

 

[Shannon Boal]

I suggest a simple test. On a dirt surface, drive at walking speed and jam on the brakes. Once stopped, get out and look at the skid patches. Did all four lock? For a good parts source, give Rick at Sunbeam Specialties a call, it is noon in California

 

[Barry]

No mention of a servo. A stock Series V master cylinder with the servo removed is not going to stop like a modern car.

What Todd said.

Passenger car hydraulic brake systems generally need something like 600 PSI at the brakes for a hard stop.

Producing a brake system hydraulic pressure of 600 PSI in a modern passenger vehicle with power brakes typically requires applying a force of about 30 pounds to the brake pedal. The federal standard allows a maximum pedal force of 75 pounds, but the OEM's recognize that (a) there are a lot of women drivers and that (b) a lot of women drivers are not comfortable with a pedal force greater than 35-40 pounds.

Producing a brake system hydraulic pressure of 600 PSI in a S-V Alpine with a factory 7/8" diameter brake master cylinder, with the factory original brake pedal setup (~ 4.25:1 mechanical ratio) and with a 2.0:1 ratio remote hydraulic booster requires a pedal force of about 43 pounds. Without a remote hydraulic booster, the required pedal force doubles to about 86 lbs.

If you are used to a brake pedal force of 30 pounds, a brake pedal force of 40+ pounds will seem "stiff" and a brake pedal force of 80+ pounds will seem "rock hard."

 

[Shannon Boal]

The photos from amazon show friction code "FF" https://www.amazon.com/MAGMA-PSD2C-...fix=sunbeam+alpine+brake+parts,aps,129&sr=8-6

 

[911tr8r]

I suggest a simple test. On a dirt surface, drive at walking speed and jam on the brakes. Once stopped, get out and look at the skid patches. Did all four lock? For a good parts source, give Rick at Sunbeam Specialties a call, it is noon in California

Great idea. My. driveway is 500ft gravel. I think I will test right now.
And yes servo is disconnected. My 64 ford falcon sprint did not have power brakes and it could really stop. Of course while drums can fade they usually have a large friction surface. THANKS FOR THE TIP

 

[911tr8r]

What Todd said.

Passenger car hydraulic brake systems generally need something like 600 PSI at the brakes for a hard stop.

Producing a brake system hydraulic pressure of 600 PSI in a modern passenger vehicle with power brakes typically requires applying a force of about 30 pounds to the brake pedal. The federal standard allows a maximum pedal force of 75 pounds, but the OEM's recognize that (a) there are a lot of women drivers and that (b) a lot of women drivers are not comfortable with a pedal force greater than 35-40 pounds.

Producing a brake system hydraulic pressure of 600 PSI in a S-V Alpine with a factory 7/8" diameter brake master cylinder, with the factory original brake pedal setup (~ 4.25:1 mechanical ratio) and with a 2.0:1 ratio remote hydraulic booster requires a pedal force of about 43 pounds. Without a remote hydraulic booster, the required pedal force doubles to about 86 lbs.

If you are used to a brake pedal force of 30 pounds, a brake pedal force of 40+ pounds will seem "stiff" and a brake pedal force of 80+ pounds will seem "rock hard."

GREAT INFO!! That certainly accounts for why I about go thru the windshield of my C6 Vette after driving the S5

 

[911tr8r]

What Todd said.

Passenger car hydraulic brake systems generally need something like 600 PSI at the brakes for a hard stop.

Producing a brake system hydraulic pressure of 600 PSI in a modern passenger vehicle with power brakes typically requires applying a force of about 30 pounds to the brake pedal. The federal standard allows a maximum pedal force of 75 pounds, but the OEM's recognize that (a) there are a lot of women drivers and that (b) a lot of women drivers are not comfortable with a pedal force greater than 35-40 pounds.

Producing a brake system hydraulic pressure of 600 PSI in a S-V Alpine with a factory 7/8" diameter brake master cylinder, with the factory original brake pedal setup (~ 4.25:1 mechanical ratio) and with a 2.0:1 ratio remote hydraulic booster requires a pedal force of about 43 pounds. Without a remote hydraulic booster, the required pedal force doubles to about 86 lbs.

If you are used to a brake pedal force of 30 pounds, a brake pedal force of 40+ pounds will seem "stiff" and a brake pedal force of 80+ pounds will seem "rock hard."

Good point about feeling rock hard. No matter the amount of force applied tho the pedal doe not give more than a few mm,

 

[911tr8r]

What Todd said.

Passenger car hydraulic brake systems generally need something like 600 PSI at the brakes for a hard stop.

Producing a brake system hydraulic pressure of 600 PSI in a modern passenger vehicle with power brakes typically requires applying a force of about 30 pounds to the brake pedal. The federal standard allows a maximum pedal force of 75 pounds, but the OEM's recognize that (a) there are a lot of women drivers and that (b) a lot of women drivers are not comfortable with a pedal force greater than 35-40 pounds.

Producing a brake system hydraulic pressure of 600 PSI in a S-V Alpine with a factory 7/8" diameter brake master cylinder, with the factory original brake pedal setup (~ 4.25:1 mechanical ratio) and with a 2.0:1 ratio remote hydraulic booster requires a pedal force of about 43 pounds. Without a remote hydraulic booster, the required pedal force doubles to about 86 lbs.

If you are used to a brake pedal force of 30 pounds, a brake pedal force of 40+ pounds will seem "stiff" and a brake pedal force of 80+ pounds will seem "rock hard."

Great idea. My. driveway is 500ft gravel. I think I will test right now.
And yes servo is disconnected. My 64 ford falcon sprint did not have power brakes and it could really stop. Of course while drums can fade they usually have a large friction surface. THANKS FOR THE TIP

Good point about feeling rock hard. No matter the amount of force applied tho the pedal doe not give more than a few mm,

 

[alpine_64]

If the servo was removed and they left the stock MC the pedal load will be much higher. The usual process when removing the servo is to switch the the larger early style Brake MC that was designed for non servo assistance to make the pedal psi more tolerable