l have a peugeot 306 xl 1.4 1996 and all my indicators work but my hazard lights do not work and when the button is pressed the revs drop a little lower......
can anyone help me please!!!!!!!!

Its a Peugeot that its a hazard goes with out saying.
Feel lucky it rolls down hill.

You probably need to replace a blown fuse.
This is usually not a very expensive job.
Because; usually, both bulbs do not go bad at the same time.
Check your blinkers, l bet they both work.

There r 4 bulbs for ur ''hazard lights not two. l think this is all contolled by fuse #6, but if ur indicators work, then a fuse is NOT the problem.

Even when ur car is turned OFF, the hazard lights should work.
Because ur turn indicators work, this tells me that the flasher relay IS WORKING FINE. It is a light gray, cubical relay, 3 cm each dimension, located among the fuses. When u pull it out, u will see 3 flat prongs on it, & the numbers: 2042103 12V 42/92 W DOT A 73385 or something similar.

l suspect the dashboard hazard switch itself is the problem. When u push the switch in. a short circuit happens to drop ur ''revs'' a bit.

#1. If u could exchange relays with another GOOD 306, & have NO PROBLEM, this would prove ur relay is at fault.

#2. If Exchanging relays creates no solution to the problem, this proves ur hazard switch is at fault. You need a new dashboard switch. From the 306 wiring schematic in front of me now, this seems to be a complicated switch with 8 connections made by a White or Black plastic connector.
l have had problems with Peugeot dashboard switches from the early 1990 is too. (Fog lamp). They do not last forever.

You could get a cheap relay or switch from a ''breaker''. This item is not in demand, & should be very low priced. (from my knowledge, the same switch is found in a 205 (1987-1998)

PS! my brother in law sells used BMW's. He hates BMW electronics. ALL cars have electrical problems, especially after 10 years.

French electrics!!!!
Swop it for anything