80mm calipers

[dave lowry]

Sorry for the dumb questions, but I think I missed the begining of this
thread.

Are the 80mm calipers better because they provide more contact area than
the OEMs? Are they direct bolt on replacements for the OEMs, using the OEM
discs?

If answers are yes, at $12.99 per wheel, plus hoses and pads, this sounds
like an exceptionally inexpensive upgrade to the OEM front disc brakes and
I'm going to start rounding up the parts for my next brake job.

Here I go again.

TIA

Dave (& Dege), Santa Barbara, '76 Royale 26'

 

[patrick flowers]

>
> Are the 80mm calipers better because they provide more contact area than
> the OEMs?

Larger piston diameter than stock calipers. Therefore, for any given
brake line pressure, you get greater piston surface pressure. In
layman's terms, more braking power.

> Are they direct bolt on replacements for the OEMs, using the OEM
> discs?

Some minor mods - see my web page for details.

Patrick
- --
Patrick Flowers
Mailtoatri63

The GMC Motorhome Page
http://www.gmcmotorhome.com

 

[ted schurman]

This action would require a longer throw in the master cyl. Have people
with the 80 mm. caliper noticed this effect or perhaps a softer pedal ?

Ted Schurman
73 Glacier VA

>

>
> the OEMs? Are they direct bolt on replacements for the OEMs, using the OEM
> discs? >>
>
> It is not the contact area because the pads would have the same contact. The
> pressure in the hydraulic system is proportional to the area of the piston in
> the caliper. So, a larger caliper will exert more pressure on the pads and
> result in faster braking and/or less pedal pressure for the same braking.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM

 

[patrick flowers]

>
> This action would require a longer throw in the master cyl. Have people
> with the 80 mm. caliper noticed this effect or perhaps a softer pedal ?

Disk brake pistons move very little, so I would think the additional
master cylinder travel would be minimal.

Patrick
- --
Patrick Flowers
Mailtoatri63

The GMC Motorhome Page
http://www.gmcmotorhome.com