Why does my 95 Chevy truck manual transmission squeal when I depress the clutch in or out of gear Does fact that have a bad break line leak effect hydraulic system?

The squealing from your 1995 Chevy truck's manual transmission when you depress the clutch, regardless of gear, strongly suggests a problem with the clutch throwout bearing. This bearing rides on the input shaft of the transmission and presses against the clutch pressure plate when you depress the clutch pedal. A worn or damaged throwout bearing will squeal, especially when the clutch is engaged or disengaged.

The brake line leak does not directly affect the hydraulic system used by the clutch. The clutch uses a separate hydraulic system (master and slave cylinder) than the brakes. However, a significant brake fluid leak *could* indirectly affect the clutch if:

* Low brake fluid level: A severe brake fluid leak might deplete the brake fluid reservoir to the point that it also affects the clutch's hydraulic reservoir if they are close and share some plumbing. This is less likely with separate systems but still possible in a poorly maintained vehicle.

* Mechanic error: If a mechanic is working on the brakes and accidentally damages the clutch hydraulic line or components, that's a possible (though unlikely) connection.

In short: Focus your attention on the clutch throwout bearing as the primary culprit for the squealing. Get the brake line leak fixed, as that's a separate, but important safety issue. But don't expect the brake problem to directly *cause* the clutch squeal. The squealing is almost certainly a clutch issue. Have a mechanic diagnose the clutch problem; it may just need lubrication or replacement of the throwout bearing, but it might be a bigger issue.