The pair arrived in a convoy of police cars and nyalas with blaring sirens just before 8am.
Few people had gathered outside the court by that time, ahead of the second day of their bail hearing.
The gates to the court were closed and only police vehicles and media cars were allowed to enter the premises.
Scores of police officers were expected to keep the peace outside the court after five schoolchildren were arrested for public violence on Wednesday.
Brandishing sticks, tree branches and ANC flags, pupils protested outside the building, vowing to "destroy" the two if they were granted bail.
The crowd promised to the return armed on Thursday.
"If the police attack students, we will come ready, armed with bricks and stones and anything... we are not afraid of them," Congress of SA Students chairman Kenneth Mbatha said.
"We will be attending school here. Jub Jub and his friend will suffer. It doesn't matter if his mother is a businesswoman, he will not get special treatment," he said to cheers.
Investigating officer Inspector Mpho Matshidiso, community policing forum chairman Mandla Gasa and his deputy Monti Mbatha gave testimony on Wednesday.
The court heard that the pair tested positive for morphine and cocaine when their urine samples were taken.
Tshabalala also had alcohol in his blood. A breathalyser showed his alcohol levels were 0.4 milligrams of alcohol per 1000 millilitres of breath. The legal limit is 0.24.
The pair was allegedly racing their Mini Coopers on Mdlalose Street, Soweto on Monday, March 8 when they crashed into a group of schoolboys, killing four and critically injuring two.
They face four charges of murder, two of attempted murder and one each of reckless and drunken driving.
The bail hearing was expected to be wrapped up by this afternoon.
(File photo: Sapa)
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