Got some talas forks (6 years old now). If I attach my pump to the forks it reads an air pressure of say 80. When I compress my forks the pump doesn’t show an increase in air pressure. Am I right in thinking that it should? The fact that is doesn’t signifies what??

A broken gauge? Try another pump.

It should yes.

I wouldn’t think about it, just away and ride the bike!

No! There’s a one-way valve in the way, I would hope.

There was a suspension telemetry device recently that suggests yes.

No! There’s a one-way valve in the way, I would hope.

Not in my recent experience.

Just because your forks are broke don’t mean they all are 😉

No! There’s a one-way valve in the way, I would hope.

No, the pump fitting holds the valve open surely? Otherwise why is when I press a button on my pump (Rockshox) does it let the air out of the fork?

haha

d’oh

in that case OP, you’re doooooooomed

There must be a valve in the way, otherwise the pump wouldn’t work!

Quick edit: is the valve in the pump, rather than the fork? That way, the release button will work, and all the pressurised air won’t leak back into the pump, as you pump it…

Presta valves are an unsprung check valve with the internal pressure pushing back. Schrader valves are sprung so either need to be held open mechanically or need a higher pressure pump side to overcome the spring. Have a look at the end of your shock pump. Does it have a pin to hold the valve core in the open position? It should do if it has a bleed button. Perhaps you need to screw it on a little further.

I agree with glasgowdan , just ride it .

Could the forks not change the pressure at the pump because air moves from the pos to the neg chamber as the forks are compressed .