Peugeot rear brake location I have a 1985 Peugeot P16 (mixte). The Weinmann 730 sidepull rear brake was located at the seatstay bridge. 

Q: Is it safe to relocate it to the gusset plate located behind the seat tube and attached to the intermediate stays (because i don't know the name of the head tube to rear drop out twin tubes!).

The brake, with a spacer, will physically fit, but i don't know if it's the right thing to do. Seems this would leave the seat stay bridge for rack &amp; fender mounting.

thanks
Yes, on my 1975 Peugeot UO18, the brakes are located on the intermediate stays and the seat stays are used for the rack mount. 

The brake configuration is visible here. 


(photo source: http://oldtenspeedgallery.com/owner-submitted/joans-1975-peugeot-mixte-uo-18/#.VWFRtmDDz88)