Replacement buses are expected to continue to run along Queen Street into Thursday morning after streetcar service was suspended due to a brake system problem.

Routes on Queen Street and west of Roncesvalles, including the 501, 501L, and 508, were taken out of commission Wednesday afternoon.

All routes were replaced by buses.

According to TTC spokesperson Stuart Green, there was an issue with the brakes on seven low floor streetcars Tuesday night and early Wednesday morning.

The TTC is removing the streetcars out of caution, he said. TTC says it is inspecting the track along the entire Queen route, from Neville Park to Long Branch, to see what is causing the damage to the bottom of the streetcars.

Green says the TTC's entire streetcar fleet will be inspected overnight to see if the brake issue is persistent elsewhere.

He says the TTC will have about 80 to 90 buses running instead of the usual 35 streetcars for the afternoon rush.

He advised transit riders to go to King station because there will be extra service on that route, or take the subway on Line 2.

There is no timeline for when streetcar service will resume.