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2005 GMC Envoy - Page 5 Questions & Answers
Need to chase thread on o2 size?
use a thread gauge to get the pitch of the thread ( threads per inch) measure the diameter of the o2 sensor and get a thread tap from a ool shop to match
some are BSP thread which is a taper so be careful that you do not remove any more metal than is necessary from the thread
I have a 2005 gmc envoy and the pedal brake was too hard en i did change the calipers , brake hose lines and power booster , and for few weeks still doing the same and now i have brakes but the some y
Usually a hard brake pedal is the brake booster. Since you replaced that it is out f the picture (unless the replacement was bad). This issue of the pedal going to the floor is troublesome and potentially dangerous. If it is not doing it all the time, it probably soon will. What most likely occurred, and this happens quite often, is that after having had the hoses and calipers replaced, it was necessary to bleed the brake system of air in order to get proper brake operation. This requires depressing the brake pedal numerous times to the floor while purging air from the system. There is a potential problem in this and that problem is that the o-rings in the master cylinder can be damaged by the bleeding process, because the normal stroke of the master cylinder is much shorter than the one used during bleeding. This sometimes results in o-ring damage because the master cylinder bore may have worn a ridge in it where the normal stroke ends. The repeated passing of the o-rings over the ridge will damage them and can cause them to fail. When this happens the pedal will drop to the floor. You really can't blame the mechanic for this but it most likely happened as a result of the work done. Have the master cylinder replaced ASAP. I wouldn't recommend using the vehicle at all in the meantime.. it is a pedal-press away form total brake failure at any given moment.
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